[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: FW: Dinosaur Weights
> In a message dated 97-08-23 07:09:31 EDT, EDELS@classic.msn.com (Allan )
> << "Most animals have about the same density as water."
> This is about 1000 kilograms per cubic meter. >>
> By definition, it should be exactly 1000 kg/m^3. But it's not. Anybody out
> there know why not? I've been wondering for years.
Temperature and density. 1 cc = 1 ml = 1 g holds exactly for pure H20
at a specific temperature. I think it's 4 degrees C, but I might be
confusing that with the max-density temperature for water. Warmer water
is less dense, so 1 g of it occupies slightly more than 1 ml. Any other
chemical present also changes the density, which is why seawater is
denser than fresh water.
(In fact, I think that equation may be the current official Bureau of
Standards definition for both liter and gram, but I'm not sure. I know
the meter is defined in terms of wavelengths of a specific frequency of