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| 1. |
Define 1st law of thermodynamics |
| Answer» According to first law of thermodynamics, energy can neither be created nor destroyed.<br>Energy can neither be created nor be destroyed<br>First Law of Thermodynamics\tThe First law of thermodynamics is same as law of conservation of energy.\tAccording to law of energy conservation: - Energy can neither be created nor be destroyed, only transformed to other forms.\tAccording to first law of thermodynamics:- The change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings.\tExamples:-\xa0Consider a ball falling from the roof of the building when at top of the building the ball has only potential energy and when it starts falling potential energy decreases and kinetic energy starts increasing. At the ground it has only kinetic energy. | |