LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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2.2. Heat
Joseph Black was the first to distinguish between the
quantity of heat and the “intensity” of heat
(temperature) and to recognize latent heat absorbed
or given off in phase transitions.
Heat Transferred during Temperature Changes
A small amount of heat added to a system is
proportional to its change in temperature of the
system if there is no phase change or chemical
reaction:
where dq is an infinitesimal amount of heat
transferred to the object and dT is a resulting
infinitesimal change in temperature. The
proportionality constant C is called the heat
capacity of the system.
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