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Different gas laws explain how temperature, pressure, volume and number of particles of gas a related to each other. Boyle’s law states that the product of pressure and volume of a fixed amount of gas at a constant temperature is constant. There are many applications of Boyle’s law in daily life such as maintaining normal pressure in aircrafts. Charles’s law states that at constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. Rising of hot air balloon is an application of Charle’s law. Gay-Lussac’s Law states that the ratio between the volumes of the gaseous reactants and the products can be expressed in simple whole numbers. Avogadro’s Law states that under the same conditions of temperature and pressure, equal volumes of all gases contain the same number of molecules.

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