CBSE Class 8 Answered
Hi Adwait,
Zeroth law of thermodynamics: When the thermodynamic systems A and B are separately in thermal equilibrium with a third thermodynamic system C, then the systems A and B are in thermal equilibrium with each other also.
First Law of thermodynamics: Whenever heat is added to a system, it transforms to an equal amount of some other forms of energy.
dQ = dU + dW
Second law of thermodynamics:
Kelvin Planck statement: It is impossible to construct a heat engine which would absorb heat from a reservoir and convert 100% of the heat absorbed into work.
Clausius statement: It is impossible to design a self acting machine unaided by external agency which would transfer heat from a body at a lower temperature to another body at a higher temperature.