Air is sealed inside a metal cylinder by a piston. The piston can move freely and the trapped air is at atmospheric pressure. The cylinder is placed in hot water. It is then removed from the water and allowed to cool. What happens to the mass of the air in the cylinder and to its pressure as it cools?
- Amass of air does not change; pressure of air does not change
- Bmass of air does not change; pressure of air changes
- Cmass of air changes; pressure of air does not change
- Dmass of air changes; pressure of air changes