Second law of thermodynamics states that the entropy of the universe always increases for all the spontaneous processes. (Also the entropy change of the universe can not be negative)
This law also states that the heat always flows from higher temperature to lower temperature body and never flows in the reverse direction.
Here are some examples of second law of thermodynamics in everyday life:
- #1 An ice cube placed in the water melts on its own, but don’t form an ice again on its own
- #2 A hot coffee left on the table cools down on its own, but don’t become hot again on its own
- #3 A ball rolling on the floor slows down and stops on its own, but don’t start to move again on its own
- #4 Gas once released from the cylinder expands on its own, but don’t come inside the cylinder again on its own
- #5 An old building slowly crushes on its own, but don’t rebuild on its own
- #6 Water falls down from the waterfall on its own, but don’t go up again on its own
- #7 Air once released from the balloon expands on its own, but don’t come inside the balloon again on its own
- #8 Two different gases mixes on its own, but don’t separates again on its own
- #9 Water once released from the tap comes down on its own, but don’t go up again on its own
- #10 While standing in a crowded room, our body feels warm and start sweating (Because, heat flows from our body to the sweat and further to the air)
- #11 While taking a bath in the hot water bathtub, the water feels warm (Because, heat flows from hot water to our body and further to the air)
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