मराठी

Nature of Heat and Work

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Nature of Heat and Work

  • Work is done during expansion or compression against external pressure and is a path function.
  • Formula: W = −Pext ΔV
  • Heat is the transfer of energy between a system and its surroundings.
  • Heat is also a path function (depends on the path followed).
  • q > 0 when heat is absorbed by system; q < 0 when heat is released.
  • Both heat and work are modes of energy transfer, not state functions.
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