define Zeroth Law of Thermodynamics: Calorie:External Work:

1 a) This law gives the concept of temperature.
b) If the temperatures of two bodies are equal then they are said to be in thermal equilibrium.
c) When two bodies A and B are in thermal equilibrium with a third body C individually, then
the bodies A and B are in thermal equilibrium with each other.
2 The quantity of heat required to rise the temperature of 1gram of water from 14.50 C to 15.50 C