What does First Law of Thermodynamics infer us?

  • It is impossible to derive any work without expenditure of an equivalent amount of energy in some other forms. 
  • Heat absorbed by the system should be taken positive. Heat rejected by the system should be taken negative. 
  • For an ideal gas the total kinetic energy (KE) of all its molecules is called internal energy(U). For such a gas the internal energy depends only on Temperature.

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