# Thread: Liquid molar density dependence on Temperature

1. Hello,
I want to know the formula, by which LIQUID MOLAR Density is dependent on temperature!
I know the formula, by which, VAPOUR MOLAR DENSITY is dependent on Temperature. Its the Universal Gas Law
PV = nRT
n/V = Rho_v = P/R/T

But what is the formula, by which Liquid molar density (Rho_l) is dependent on Temperature!

2.

3. It stands to note that PV=nRT is not the universal gas law, it is the ideal gas law. Universal implies that it applies to all gases and the law only applies to ideal gases, of which are only monatomic gases. Since the volume of liquids is independent of temperature, so is the molar density. So the formula for molar density of a liquid would simply be n/V, moles per unit volume. You have to remember that the ideal gas law only applies to gases.

4. Since the volume of liquids is independent of temperature
False! At least for my mercury thermometer.

If you want a formula that links molar density with temperature you can use the coefficient of thermal expansion.

Best regards,

César

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