Agas law that describes the direct relationship between the volumes of a gas and the number of gas particles it contains at constant temperature and pressure.

The answer is Avogadro's Law.

Explanation:

Avogardo's law states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." The derivation of Avogadro's law follows directly from the ideal gas law is:

where ;

V is the volume of the gas;

n is the amount of substance of the gas (measured in moles);

k is a constant for a given temperature and pressure

P is pressure of the environment

T is temperature of the environment

a. are

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.