Question #dc741

1 Answer
Aug 24, 2017

Density is mass per volume, #"mass"/"volume"# . The volume filled by a mass changes with the temperature.


Gases, liquids and even solids expand and contract with temperature changes due to the change in kinetic energy of their atoms. Even in the same phase, a change in temperature will change the volume of a given mass.

Therefore, to have an accurate reference to density it must include the temperature of the mass at the time the volume was measured.