Chapter-Thermal energy
Temperature
Temperature is a measure of the average kinetic energy of the atoms or molecules in the system.
Temperature is basically, the average kinetic energy in system of atoms or molecules, right? then what does that mean. Well it means that the atomes or particles in a object is moving(in a molecular level) and hence it is moving it has kinetic energy, so when we calculate the average kinetic energy of the entire set of atoms or particles , we get temperature,also, only if the kinetic energy of the entire set of atoms increase, only then the temperature will increase.
How we calculate it
The questions really helped, thanks!