Second Law Of Thermodynamics | Physics 

In this animated lecture, I will teach you second law of thermodynamics in physics.
Q: Define second law of thermodynamics?
Ans: accoding to Lord Kelvin Statement, second law of thermodynamics is defined as heat from a single source or from a single hot reservoir can't be entirely converted into work. In simple words, second law of thermodynamics states that heat from a single hot reservoir can't be converted entirely into work untill there is cold reservoir or sink.
We alll know that heat transfers from hot objects or hot regions into cold objects or cold regions. Second law of thermodynamics purely works on this natural principles or this natural process of heat transfer. That's why we call second law of thermodynamics as law of spontaneity or natural law. This us because second law of thermodynamics teaches us the method of converting heat Q into useful work W.
Second law of thermodynamics states that heat engine can only utilize the heat og hot reservoir if there is cold reservoir, because a natural process of heat transfer will occur between hot reservoir and cold reservoir.
Second law of thermodynamics teaches us the method that when heat engine absorbs heat from a hot reservoir or source, it will convert a part of this heat Q into useful work W and will expel or waste a part of this heat into cold reservoir or sink.
The example of second law of thermodynamics is the working of heat engine. Heat engine purely works on the principles of second law of thermodynamics.
Also, second law of thermodynamics states two very important points that all heat can't be converted to work, but all work can be converted to work. For example, heat engine can't convert all heat into useful work. Thus all heat can't be converted entirely into work. Secondly, for example, when you rub your hand together, you convert all mechanical work into heat.
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