Why does rate of diffusion increase with increase of temperature?

The rate of diffusion increases with increase of temperature because at high temperature molecules of a substance get high kinetic energy. The intermolecular forces also become weak. They can move and diffuse rapidly from one place to another.   

Charles's Law Definition

Charles's Law is an ideal gas law where at constant pressure; the volume of an ideal gas is directly proportional to its absolute temperature.


where:
Vi = initial pressure
Ti = initial temperature
Vf = final pressure
Tf = final temperature
T = absolute temperature in Kelvin (K) & T(K) = T°C + 273.15

charles's law

Boyle's law definition

Boyle's Law is an ideal gas law where at constant temperature; the volume of an ideal gas is inversely proportional to its absolute pressure.


PiVi = PfVf

where
Pi = initial pressure
Vi = initial volume
Pf = final pressure
Vf = final volume

Boyle's law