We deal first with constant volume and constant pressure processes and derive expressions for the corresponding principal specific heats of a monatomic ideal gas. In Section 3 attention turns to gases, where different constraints are readily applied during heating. We finish the section by outlining some techniques for measuring specific heats and latent heats. Next we discuss fusion, vaporization, sublimation and latent heats. We begin, in Section 2, by defining important some important terms, using them to discuss the heating of solids and liquids, and seeing how the temperature rise of a heated body is related, via the specific heat capacity, to the heat transferred.
We also look more generally at the problem of converting heat into useful work, and the related issue of the irreversibility of many natural processes. In this module we discuss the heating of solids, liquids and gases under a variety of conditions. What happens when a substance is heated? Its temperature may rise it may melt or evaporate it may expand and do work – the net effect of the heating depends on the conditions under which the heating takes place.
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