A pure liquid substance is heated at its boiling point and begins to vaporise.
Which of the following pairs of quantities remains constant as the substance vaporises?
Kinetic energy of molecules and internal energy of substance.
Potential energy of molecules and temperature of substance.
Kinetic energy of molecules and temperature of substance.
Potential energy of molecules and internal energy of substance.
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.