Zeroth Law of Thermodynamics

This lecture will be concentrated on the Zeroth Law of Thermodynamics. Note that this law deals with the thermal equilibrium. If we have a system A which is in equilibrium with system B and the last system also in equilibrium with system C then systems A and C are also in equilibrium.
Also we will explain the differences between Temperature and Heat.

Heat (symbol: Q) is energy. It is the total amount of energy (both kinetic and potential) possessed by the molecules in a piece of matter. Heat is measured in Joules.

Temperature (symbol: T) is not energy. It relates to the average (kinetic) energy of microscopic motions of a single particle in the system per degree of freedom. It is measured in Kelvin (K), Celsius (C) or Fahrenheit (F).

When you heat a substance, either of two things can happen: the temperature of the substance can rise or the state of substance can change.
So you have to distinguish between the two terms, Temperature and Heat. I showed you a flim about the differences in our pervious lecture.