Calculating Heat Capacity of Krypton at 90K

[gneill]

Sorry if I’ve missed something but why are you using specific heat at constant volume? The volume isn't constant; the question states that the gas is free to move along the surface. Wouldn’t it be c at constant pressure?

Well, the surface area is of a fixed size. The atoms are constrained to that fixed-size surface. It's the 2D equivalent to the 3D constant volume case.

I suppose that, notationally, the constant should be C_A, for constant area!

 

[ehild]

Sorry if I’ve missed something but why are you using specific heat at constant volume? The volume isn't constant; the question states that the gas is free to move along the surface. Wouldn’t it be c at constant pressure?

The problem states that the atoms of the 2D gas are free to move on the surface.

The particles of a normal gas in 3 dimension move freely inside the container. The volume of the gas is defined as the volume of the container.

The particles of the 2D gas move freely on a certain surface. The area of the surface plays the role of volume.


ehild