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Temperature is commonly associated with how hot or cold an object feels when we touch it. While our senses provide us with qualitative indication of temperature, they are unreliable and often misleading. A metal ice tray feels colder to the hand, for example, than a package of frozen vegetables at the same temperature because metals conduct thermal energy more rapidly than a cardboard package.

Understanding the concept of temperature requires understanding thermal conduct and thermal equilibrium. Two objects are in thermal conduct if the energy can be exchanged between them. Two objects are in thermal equilibrium if they are in thermal contact and there is no net exchange of energy. The exchange of energy between the two objects because of differences in their temperatures is called heat.

If objects A and B are separately in thermal equilibrium with a third object C, then A and B are in thermal equilibrium with each other. A thermometer is generally used to measure the amount of temperature of an object in both thermal equilibrium and during or after thermal exchange.

As temperature of the substance increases, its volume increases as a result. This phenomenon is known as thermal expansion, plays an important role in numerous applications. Thermal expansion joints, for example, must be included in buildings, concrete highways, and bridges to compensate for changes in dimensions with variations of temperature.

At ordinary temperatures, the atoms vibrate around their equilibrium positions with an amplitude of about 10^-11m, with an average spacing between the atoms of about 10^-10m. As the temperature of the solid increases, the atoms vibrate with greater amplitudes and the average separation between them increases. Consequently, the solid as whole expands.

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