# Dependency of concentration terms on temperature [closed]

I wanted to know why molarity is temperature-dependent whereas molality is temperature-independent.

• Density is temperature dependent, but mass is not. So a volume of liquid solvent changes with temperature whereas a mass of solvent does not. – Ed V Jul 10 at 12:26
• So then what is the temperature at which densities are calculated? – Shreyansh Kuntal Jul 10 at 12:28
• Any temperature. Generally, densities are measured at chosen temperatures and then the dependence is approximated by an empirical function ( as it is smooth enough ) and eventually tabelated. – Poutnik Jul 10 at 12:33
• The glassware, e.g., volumetric flash, pipette, etc., are calibrated by the manufacturer and the temperature is typically either on the glassware or in accompanying documentation. Commonly the temperature is 20 degrees C. – Ed V Jul 10 at 12:35
• @Shreyansh Kuntal Your last question should rather be: "So then what is the temperature at which volumes are measured? ", as this is the one Ed V has answered. – Poutnik Jul 10 at 12:47