First law of thermodynamics
First law of thermodynamics: The internal energy U of a system can change through two modes of energy transfer: heat and work. Let
ΔQ =...
Heat, Internal Energy and Work
Heat and work:
Heat
Work
Heat is a mode of energy transfer due to the temperature difference between the system and the surrounding.
Work is the mode of energy...
Thermodynamics, Thermal Equilibrium & Zeroth law of Thermodynamics
Thermodynamics is the branch of physics that deals with the concepts of heat and temperature and the inter-conversion of heat and other forms of...
Stefan’s Law & Wien’s displacement law
Stefan’s Law
This law states that the total heat energy emitted by a perfect black body per second per unit area is directly proportional to...
Black Body Radiation
A black body is one which neither reflects nor transmits but absorbs the whole of the heat radiation incident on it. The absorptive power...
Newton’s Law of Cooling
According to Newton’s Law of Cooling, the rate of cooling of a body is directly proportional to the difference in temperatures of the body...
Heat transfer
Heat is energy transfer from one system to another or from one part of a system to another part, arising due to temperature difference.
There...
Latent Heat
The heat required during a change of state depends upon the heat of transformation and the mass of the substance undergoing a change of...
Calorimetry
Calorimetry means the measurement of heat. When a body at higher temperature is brought into contact with another body at a lower temperature, the...
Specific Heat Capacity
The specific heat of a substance may be defined as the amount of heat required to raise the temperature of unit mass of the...