Lesson: Thermodynamic Changes in Ideal GasesPhysics
In this lesson, we will learn how to calculate the net heating of and net work done by ideal gases that change pressure, volume, and temperature.
Sample Question Videos
A gas with a mass of 0.125 kg is contained in a rigid container with a volume of 2.5 m3. The gas is heated, increasing its temperature by 35 K and also increasing its pressure, as shown in the diagram. Calculate the change in the internal energy of the gas due to its heating. Use a value of 1.75 kJ/kg⋅K for the specific heat capacity of a constant volume of the gas. Assume the heating of the container is negligible. Answer to three significant figures.
A gas consisting of 2.5 moles of particles is compressed isothermally, as shown in the diagram. The gas has a temperature of 360 K. Find the work done on the gas to compress it. Use 8.31 m2⋅kg/s2⋅K⋅mol for the value of the molar gas constant. Give your answer to three significant figures.
The diagram shows the changes of volume with temperature of three gases.
Which gas is changing isobarically?
For which gas is work being done to compress the gas?