CBSE Class 11-science Answered

Dear Student

According to the kinetic molecular theory, the average kinetic energy of an ideal gas is directly proportional to the absolue temperature. Kinetic energy is the energy a body has by virtue of its motion:

Ke= 1/2  mv²

As the temperature of a gas rises, the average velocity of the molecules will increase; a doubling of the temperature will increase this velocity by a factor of four. Collisions with the walls of the container will transfer more momentum, and thus more kinetic energy, to the walls. If the walls are cooler than the gas, they will get warmer, returning less kinetic energy to the gas, and causing it to cool until thermal equilibrium is reached. Because temperature depends on the average kinetic energy, the concept of temperature only applies to a statistically meaningful sample of molecules. We will have more to say about molecular velocities and kinetic energies farther on.

If you plot Pressure vs temperatre its a stright line.If we extend teh stright line on to T-axis it tuches at -273.149..C

It comes from experiments but not from theory.

Regards

Team

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