Final answer:
Avogadro's law states that the volume of a gas is directly proportional to the number of molecules or moles present, provided that temperature and pressure are constant, summed up by the formula V = k × n.
Step-by-step explanation:
An alternate way to state Avogadro's law is, "all other things being equal, the number of molecules in a gas is directly proportional to the volume of the gas." Avogadro's law essentially states that equal volumes of different gases, at the same temperature and pressure, contain the same number of molecules. This means, as the number of molecules (or moles) of a gas increases, the volume increases accordingly if the temperature and pressure remain constant. The mathematical expression of Avogadro's Law is V = k × n, where V represents the volume, k is a constant, and n is the number of moles of the gas.