What is enthalpy?

  • Google+ icon
  • LinkedIn icon

Enthalpy (given the symbol H) is a measure of how much heat energy can be released by a chemical. ΔH is defined as the amount of heat energy released or taken in when two chemicals react. If ΔH is negative it means that the reaction is exothermic and will give out heat as it progresses and will feel hot.

If ΔH is positive then the reaction is endothermic and will therefore absorb heat as it progresses, and will feel cold.

Chris M. GCSE Chemistry tutor, A Level Chemistry tutor, GCSE Biology ...

About the author

is an online A Level Chemistry tutor with MyTutor studying at Oxford, St Catherine's College University

How MyTutor Works

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss