Enthalpy change (ΔH) — Science definition

The heat absorbed or released by a reaction at constant pressure; negative for reactions that release heat, positive for reactions that absorb it.

Where it is taught

• Energy in Chemical Reactions — Chemical Energy & Thermodynamics, Physical Science: Chemistry, Grade 11

Taught alongside

• exothermic reaction
• endothermic reaction
• bond energy
• activation energy (Ea)
• specific heat (c)

Elsewhere

• All science terms
• All courses and reading

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