what is the meaning of perpatual
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The term perpetual motion exactly refers to the movement that goes forever. However the term usually refers to any device that
Always produces more energy than it consumes that ultimately results in a net output of energy for indefinite time. The law of conservation of energy states that energy cannot be created or destroyed, according to this law there could not be any such kind of machine in existence.
The most commonly contemplated type of perpetual motion machine is a mechanical system which sustains motion indefinitely, regardless of losing energy to friction and air resistance. A second type of impossible “perpetual motion machine” is one which does not violate conservation of energy, but produces work by spontaneously extracting heat from its surroundings, thereby cooling them down, and converting the heat energy into mechanical work. Such machines are prohibited by the second law of thermodynamics.
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Explanation:
perpetuity
/pəːpɪˈtjʃuːɪti,pəːpɪˈtjuːɪti/
noun
1.
the state or quality of lasting forever.
"he did not believe in the perpetuity of military rule"
2.
a bond or other security with no fixed maturity date.