Difference between Solid and Liquid and Gas || Condition OF Sub to Exist in S/L/G on basis OF P and T || Measurable Properties OF Gases-mass and Volume

How do solids, liquids and gases differ in shape and volume ?

Assertion : The difference between DeltaH and DeltaU is not significant for systems consisting of only solids and/or liquids. Reason : Solids and liquids do not suffer any significant volume changes upon heating.

The graph between (P/T) and T for a gas at constant volume will be:

During an experiment, an ideal gas is found to obey a condition Vp^2 = constant. The gas is initially at a temperature (T), pressure (p) and volume (V). The gas expands to volume (4V).