Avogadro’s Law is one of the gas laws. At the beginning of the 19th century, an Italian scientist Lorenzo Romano Amedeo Carlo Avogadro studied the relationship between the volume and the amount of substance of gas present. The results of certain experiments with gases led him to formulate a well-known Avogadro’s Law. It states that, under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules, or:
For a fixed mass of an ideal gas at constant pressure and temperature, the volume and amount of the gas are directly proportional.
You can express this mathematically as:
V ∝ n
V = constant . n
where nR/V is constant and:
- n is the amount of substance measured in moles
- V is the volume of the gas
the constant is equal is to RT/p, where p is the absolute pressure of the gas, T is the absolute temperature and R is the ideal, or universal, gas constant, equal to the product of the Boltzmann constant and the Avogadro constant.