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What is meant by Toroid ?
Define internal energy.
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1 : a surface generated by a closed plane curve rotated about a line that lies in the same plane as the curve but does not intersect it. 2 : a body whose surface has the form of a toroid.
The internal energy of a thermodynamic system is the energy contained within it. It is the energy necessary to create or prepare the system in any given internal state. ... The thermodynamic processes that define the internal energy are transfers of matter, or of energy as heat, and thermodynamic work.
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