States of matter are the... A: law that states that for a fixed amount of gas at a constant temperature, the volume of the gas increases as its pressure decreases and the volume of the gas decreases as its pressure increases.

B: physical forms in which a substance can exist; includes solid, liquid, gas, and plasma.
C: term used to describe a physical or chemical change in which energy is given of.

D: temperature at which a liquid boils and becomes a gas.