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Unified Code for Units of Measure (UCUM)

The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.

The UCUM website is available at https://ucum.org.

Help inform potential changes to the UCUM license

We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.

New version 2.2

Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:

  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit

A number of constants represented in the specification have been updated per NIST. These include:

  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass

Additionally, this release corrects a number of misspellings and typographic errors.

This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.

Don't miss anything

Receive notification of new UCUM releases and other important happenings by joining our mailing list.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
About
ucum.org
Resources
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Activity
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Stars
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
About
ucum.org
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
About
ucum.org
Resources
Readme
License
Activity
Custom properties
Stars
0 stars
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0 watching
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0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
About
ucum.org
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Activity
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Stars
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
Don't miss anything
Receive notification of new UCUM releases and other important happenings by joining our mailing list.
About
ucum.org
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Unified Code for Units of Measure (UCUM)
The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business. The purpose is to facilitate unambiguous electronic communication of quantities together with their units. The focus is on electronic communication, as opposed to communication between humans. A typical application of The Unified Code for Units of Measure are electronic data interchange (EDI) protocols, but there is nothing that prevents it from being used in other types of machine communication.
The UCUM website is available at https://ucum.org.
Help inform potential changes to the UCUM license
We would like to understand your use of UCUM, specifically any adverse limitations imposed by the current license. Our goal is a license that permits legitimate use of UCUM while maintaining its free nature and ensuring its longevity as an international standard. We ask that you complete a brief survey on our website.
New version 2.2
Regenstrief Institute and the UCUM Committee are excited to announce the release of UCUM version 2.2, now available from the UCUM website and UCUM's GitHub repository. UCUM 2.2 adds two new units:
  • [NTU] for Nephelometric Turbidity Unit
  • [FNU] for Formazin Turbidity Unit
A number of constants represented in the specification have been updated per NIST. These include:
  • Newtonian constant of gravitation
  • Boltzmann constant
  • elementary charge
  • vacuum electric permittivity
  • Avogadro's constant and associated values including atomic mass constant
  • proton mass
  • electron mass
Additionally, this release corrects a number of misspellings and typographic errors.
This is the first release of UCUM since May 2017 and the first using GitHub. We will continue to address outstanding issues and entertain requests for new units. We welcome your requests and feedback in the form of New Issues or New Discussions. While an official cadence has yet to be established, our intent is to provide the next release of UCUM later in 2024.
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