Ideal gas law was developed to relate the (microscopic) behavior of atoms to macroscopic properties such as pressure and temperature.The ideal gas law is based on the kinetic theory of molecules.The postulates are as follows:
- The size of the atoms is small compared to the distance between them.They behave as point particles and their identity (type of element) & distinct properties based on their identity does not matter.
- Absence of force of attraction or repulsion between molecules.
- The atoms are in rapid motion and constantly colloid with each other and with the walls of the container .
- The collisions are perfectly elastic and therefore no energy is lost due to collisions.
- Kinetic energy of molecules is a function of temperature only.
Gas molecules are found to abide by these postulates at low pressures(below 1 atm) and high temperatures.
The ideal gas equation #PV= nRT#
#V/n# is the specific molar volume of the gas
The equation can be applied if the following thumb rule is satisfied
#V/n# > 5L/mole (for diatomic gases)
#V/n# > 20L /mole (other gases)