Charles’ Law
At constant pressure the volume( V) of a given mass of gas is directly proportional to its absolute temperature( T), i. e.,
V ∝ T ⇒ V / T = constant For a given gas, V1 / T1 = V2 / T2
At constant pressure the volume( V) of a given mass of a gas increases or decreases by 1 / 273.15 of its volume at 0 ° C for each 1 ° C rise or fall in temperature.
Volume of the gas at t ° Ce
Vt = V0( 1 + t / 273.15)
where V0 is the volume of gas at 0 ° C. Gay Lussacs’ or Regnault’ s Law
At constant volume the pressure p of a given mass of gas is directly proportional to its absolute temperature T, i. e., p ∝ T ⇒ V / T = constant
For a given gas, p1 / T1 = p2 / T2
At constant volume( V) the pressure p of a given mass of a gas increases or decreases by 1 / 273.15 of its pressure at 0 ° C for each l ° C rise or fall in temperature.
Volume of the gas at t ° C, pt = p0( 1 + t / 273.15) where P0 is the pressure of gas at 0 ° C. Avogadro’ s Law
Avogadro stated that equal volume of all the gases under similar conditions of temperature and pressure contain equal number molecules. This statement is called Avogadro’ s hypothesis. According Avogadro’ s law
( i) Avogadro’ s number The number of molecules present in 1g mole of a gas is defined as Avogadro’ s number.
NA = 6.023 X 10 23 per gram mole