40 points correct answer
why does hot air rise and cold air sink?

a ) cold air has more kinetic energy than hot air.

b ) hot air has more potential energy than cold air.

c ) cold air is more dense than hot air.

d ) hot air is more dense than cold air.

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.