# What is the mass of water? (be precise)

**URL:** <https://boards.straightdope.com/t/what-is-the-mass-of-water-be-precise/1002162>\
**Category:** Factual Questions\
**Created:** [May 27, 2024, 11:53pm UTC](https://boards.straightdope.com/t/what-is-the-mass-of-water-be-precise/1002162 "2024-05-27T23:53:17Z")\
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**Author:** ![DPRK](https://avatars.discourse-cdn.com/v4/letter/d/4491bb/32.png) [@DPRK](https://boards.straightdope.com/u/DPRK)\
**Post date:** [May 28, 2024, 4:52am UTC](https://boards.straightdope.com/t/what-is-the-mass-of-water-be-precise/1002162/5 "2024-05-28T04:52:52Z")

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> [@N9IWP](#):
>
> Depends on the concentration of deuterium, that can add a few femtograms…

> **[Vienna Standard Mean Ocean Water](https://en.wikipedia.org/wiki/Vienna_Standard_Mean_Ocean_Water)**
>
> Vienna Standard Mean Ocean Water (VSMOW) is an isotopic standard for water, that is, a particular sample of water whose proportions of different isotopes of hydrogen and oxygen are accurately known. VSMOW is distilled from ocean water and does not contain salt or other impurities. Published and distributed by the Vienna-based International Atomic Energy Agency in 1968, the standard and its essentially identical successor, VSMOW2, continue to be used as a reference material. 
> Water samples made u...

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