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Thread: Why is the density of water an exact mathematical value?

  1. #1 Why is the density of water an exact mathematical value? 
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    Hello everyone,

    As far as I know The standard units for Mass and of Distance is historically not derived from the mass and volume properties of water.(Or am I wrong?)

    Then why is that the density of Water is exactly 1000 kg/m^3 ?

    I think It's impossible unless the standard unit off mass or distance is derived from the mass and volume property or water.


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  3. #2  
    Forum Professor jrmonroe's Avatar
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    The density of water is a function of a couple of conditions, the one with the strongest correlation being temperature. You'll encounter this with work in chemistry labs.


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  4. #3 Re: Why is the density of water an exact mathematical value? 
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by vilyanurchandra
    Hello everyone,

    As far as I know The standard units for Mass and of Distance is historically not derived from the mass and volume properties of water.(Or am I wrong?)
    You are. The gram was first defined as the weight of 1 cc of water.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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  5. #4  
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    and the metric system was invented by french scientists that measured the distance from the north pole to the equator and divided it into a million. but water solutions have different weights. say if it is saturated with salt for instance
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