density = mass/volume

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density = mass/volume

Postby rdabke » Fri Apr 29, 2005 4:50 am

Is it true that X ml. of water weighs X mg,

but X ml of other substances denser than water weighs more than X mg (directly proportional to its density)?
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Postby Guest » Fri Apr 29, 2005 5:26 am

No, 1 mL of water weighs (approximately) 1 g, or 1 L of water about 1 kg. At 4 degrees C, the maximum density of water occurs and weight is 0.999 973 g/mL. Except for extreme accuracy, that is ~1.

Water expands with increasing temperature. At 25 degrees C, densitu is 0.996783 g/mL.

Items which are denser than water weigh more than 1 g/mL
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Postby rdabke » Fri Apr 29, 2005 11:56 pm

So then, how does 1 fl. oz of water weight 1 oz.?
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Postby Guest » Sat Apr 30, 2005 5:57 pm

In the US gallon, it doesn't. 1 US gallon is about 8.33 lbs, and divided into 128 fluid ounces, so it is about 1.04 av. oz.

The Imperial gallon, of 160 oz, is defined as 10 lbs of water,
so 10 lbs/gal x 16 oz/lb x 1gal/160 oz works out to 1 av oz/ Imp. fl. oz.
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