Chemistry / Unit 4 Chem 0678 short lesson, about 20 seconds
Enthalpy
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The idea
Enthalpy is a state function equal to internal energy plus pressure times volume; its change equals heat flow at constant pressure.
In practice
The heat released by a Bunsen burner's flame equals its combustion reaction's enthalpy change, since it burns at roughly constant pressure.
Where people slip
A reaction's heat measured in a sealed bomb calorimeter is not its enthalpy change, since pressure there can shift freely.
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