Physics in Depth

Second law of thermodynamics Consider a container with rigid walls partitioned into two separate walls with a valve such that a gas is put in one part and other part is created a vacuum. Now, the valve is opened and the gas eventually occupies both the parts of the container. Is the reverse possible? i.e., put the gas in both the parts of the container with the valve open. Is it possible for the gas go into one part and evacuate the other part all by itself? Ofcourse , NOT . It does not even violate the first law of thermodynamics but still the reverse process does not occur. This is explained by the another law called the second law of thermodynamics . Second law of thermodynamics can mainly be stated by following two statements: Kelvin's statement : It is impossible to get a continuous supply of work from a body by cooling it to a temperature lower than that of its surroundings. Clausius statement : It is impossible for a self acting machine unaided