In every thermodynamics textbook there are tables containing the specific volume of various fluids at different temperatures and pressures. My question is, how is this data obtained experimentally?
I can imagine that this could be done with a piston arrangement where a known mass of the substance is placed inside, a known pressure is applied and the whole system is heated to a specific temperature. The specific volume could then be measured, giving an experimental data point. However, I was not able to find any reference to state if this is actually the most accurate method available.
Could anyone share any information on the apparatus and method that is used to accurately measure the specific volumes of fluids?