When potassium is added to water, it is seen that the lower region becomes warm first and becomes less dense. It then moves up and the more dense cold water comes down and the process goes on. What is the process taking place? a) Radiation b) Conduction c) Convection d) Purification

When two objects are in thermal equilibrium with a third object, then: A.They are in contact with each other. B.They are in thermal equilibrium with each other. C.They are at odds with one another. D.They must be transferring heat between each other.

If no heat is added to a gas, its temperature can still go up by: A. letting it do work B. compressing the gas C. expanding the gas D. putting it in the refridgerator

Which of the following best describes a substance in which the tempeture remains constant while at the same time it is experiencing an inward heat flow? A. Substance undergoing a change of state B. every substance undergoes a change in tempeture when heat is given to it C. solid D. gas E. liquid