Air Pressure in a Car Tyre Increases During Driving, Here’s Why
BY Team Aakash Byju's
Consider the movement of particles inside a substance. We know that the particles are not at rest and will move or rotate from one place to another within their chemical structure.
We can increase the speed of this motion of particles by providing energy in the form of heat. This means that heat increases the pressure on the molecules/particles.
Now consider a moving car and observe its tyres. There will be friction between the tyre and the road.
During driving, the work is done against this frictional force which is converted into heat.
Or we can say that the external energy is applied to the tyre due to which it moves in a certain direction.
Now, this energy causes an increase in the temperature of gas molecules inside the tyre.
Though the temperature is raised for the molecules of the tyre, the volume of the tyre remains constant. i.e., the size of the tyre neither increases or decreases.
The number of molecules is also constant as we are not adding any molecules, nor are we taking them out.
So, per Gay-Lussac’s law, at constant volume (of tyre) pressure on the tyre increases as the temperature increase by heat energy applied.
This is why the pressure in a car tyre increases when you drive.