Site navigation

Which law of thermodynamics gives the concept of enthalpy?

Question and options

Which law of thermodynamics gives the concept of enthalpy?
  1. 1st law of thermodynamics
  2. 2nd law of thermodynamics
  3. Zeroth law of thermodynamics
  4. 3rd law of thermodynamics

Answer and explanation

Correct answer: A - 1st law of thermodynamics
Enthalpy H=U+PVH = U + PV arises from the first law (dQ=dU+P dV\mathrm{d}Q = \mathrm{d}U + P\,\mathrm{d}V): at constant pressure the heat absorbed equals the change in H.

Practice for these exams

  • CUSAT CAT M.Sc. Forensic Science

  • Bihar Judicial Services

    Subject revision

  • Uttarakhand Judicial Services

    Subject revision

Related question papers

Related exam syllabi

More solved explanations in General science & technology