from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water at 4°C (39°F) or of a gas to an equal volume of air or hydrogen under prescribed conditions of temperature and pressure.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The
ratioof the massof a substanceto that of an equal volumeof waterat 4°C (or to some other referencesubstance)
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the density of a substance relative to the density of water
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