Question

the measure of extent of kinetic energy of particles

Answer 1

kinetic energy = 1/2mv^2
where m is the mass of the particle and v is the velocity with which the particle is moving.

Answer 2

Temperature is characterized as the measure of the normal dynamic vitality of the particles in a sample of matter. The speedier particles move and knock around with each other, the more humid the temperature. the slower atoms move and knock around with each other, the colder the temperature.

The assumed total zero temperature is the point at which no particles are moving. This is zero degrees Kelvin (the absolute temperature scale).