Write a short note on Laws of Gases

FUNDAMENTAL LAWS OF GASES

  • The three fundamental laws which connect the relation between pressure, volume and temperature are as follows:
      1. Boyle’s Law
      2. Charles’s law
      3. Avogadro’s law

Boyle’s law:

  • When the temperature of a gas is kept constant, the volume of a fixed mass of gas is inversely proportional to its pressure.

P ∝ l/V

  • In other words, for an invariable mass of a perfect gas, at a constant temperature, the product of its pressure and volume is a constant. (i.e) PV = constant

Charles’s law (The law of volume)

  • Charles’s law was formulated by French scientist Jacques Charles. According to this law, When the pressure of the gas is kept constant, the volume of a gas is directly proportional to the temperature of the gas.

V∝T

or

V / T = constant

Avogadro’s law

  • Avogadro’s law states that at constant pressure and temperature, the volume of a gas is directly proportional to the number of atoms or molecules present in it.

i.e. V∝ n

(or)

V / n = constant

  • Avogadro’s number (N) is the total number of atoms per mole of the substance.
  • It is equal to 6.023 x 1023/mol.

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