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How can I estimate the density of a liquid mixture (e. g. liquid air?)
- What is the density of liquid air at its highest temperature?
I can give you a quick back-of-the-envelope estimate, but I don't have that data.
Cryogenic properties of gases, taken from the CRC Handbook of Chemistry and Physics
The highest temperature for liquid air is the boiling point for nitrogen gas.
If I assume that liquid air is an "ideal solution" (that is, all the molecules in the mixture interact the same way, whether they're oxygen, nitrogen, or argon), I can write
density of liquid air = 0.78084 × density of nitrogen + 0.20946 × density of oxygen + 0.00934 × density of argon
where the fractions are the volume fractions of each component in pure, dry air. (They don't add up to 1 because I'm ignoring all the trace gases, including CO2, to keep things simple).
If I further assume that the densities of liquid oxygen and liquid argon aren't much different at the boiling point of nitrogen then they are at their own boiling points, I can write
the density of liquid air at the boiling point of nitrogen as
(0.78084 × 804 kg/m3) +
(0.20946 × 1142 kg/m3) +
(0.00934 × 1390 kg/m3) = 880 kg/m3
or a bit less dense than water is around room temperature.
|Gas||Density, kg/m3||Boiling point at 1 atm, K|
Author: Fred Senese firstname.lastname@example.org