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The text begins by establishing a clear distinction between heat and temperature. Temperature measures the average kinetic energy of the atoms within a substance, while heat represents the actual transfer of thermal energy between systems. This leads into the study of thermal expansion, examining how materials expand linearly, superficially, or volumetrically when heated. A key highlight is the anomalous expansion of water, a unique property where water expands as it cools below 4^\circ\text{C}, keeping aquatic ecosystems alive in freezing winters.
Finally, the chapter introduces calorimetry, defining specific heat capacity and latent heat—the hidden energy required to change a substance's phase without altering its temperature. It concludes by exploring the three distinct modes of heat transfer: conduction through solids, convection through fluids, and radiation, which allows solar energy to travel through the vacuum of space to warm our planet.
