What is the term for a push or a pull on an object

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Light waves travel than sound waves.