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