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Will Relative density of water change based on the state it is in? Ie solid, liquid, gas.

What causes this change(if any) in Rd?

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You should be aware that use of "relative density" is much less common than "specific gravity" for describing this concept. –  dmckee May 31 '12 at 14:50
    
@dmckee: The Wiki articles states that the use of relative density is preferred :) –  Bernhard May 31 '12 at 14:54
    
See en.wikipedia.org/wiki/Properties_of_water for info on the density of water and ice. The density of steam is pressure and temperature dependant. –  John Rennie May 31 '12 at 15:03
    
@Bernhard: It might be "preferred", but the actual use on the ground is driven by history and habit. –  dmckee May 31 '12 at 15:25
    
This was a more brief way of saying is the specific gravity of solid(frozen) water relative to the specific gravity of liquid water different. –  Argus May 31 '12 at 16:20
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1 Answer

up vote 2 down vote accepted

Yes the density of water changes with temperature in a non-linear way (which is important if you want life on your planet).

It has a maximum density at 4deg C and is unusual in that it expands (lower density) as a solid - see http://en.wikipedia.org/wiki/Water_(properties)#Density_of_water_and_ice

As a gas it's density varies with temperature and pressure like any other gas.

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