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Presentation transcript:

substance or substances under study everything else system surroundings substance or substances under study everything else …especially in the vicinity of the substances under study …what you choose to look at We’ll always take this perspective!

Enthalpy: The property of a substance that can be used to obtain the heat absorbed or released in a change at constant pressure Depends only on the present state of a substance…not how it got where it is… A State Function There is no natural benchmark for zero enthalpy, therefore it can’t be absolutely measured… (in other words…a substance’s capacity to exchange heat) Symbol: H but it can be measured relatively