Thermal expansion | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Thermal expansion


00:00:44 1 Overview
00:00:53 1.1 Predicting expansion
00:01:13 1.2 Contraction effects (negative thermal expansion)
00:02:02 1.3 Factors affecting thermal expansion
00:03:12 2 Coefficient of thermal expansion
00:04:30 2.1 General volumetric thermal expansion coefficient
00:05:34 3 Expansion in solids
00:06:51 3.1 Linear expansion
00:08:57 3.1.1 Effects on strain
00:12:56 3.2 Area expansion
00:14:48 3.3 Volume expansion
00:19:12 3.3.1 Isotropic materials
00:23:28 3.4 Anisotropic materials
00:24:25 4 Isobaric expansion in gases
00:28:14 5 Expansion in liquids
00:29:22 5.1 Apparent and absolute expansion of a liquid
00:31:22 6 Examples and applications
00:36:46 7 Thermal expansion coefficients for various materials



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SUMMARY
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Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more and usually maintain a greater average separation. Materials which contract with increasing temperature are unusual; this effect is limited in size, and only occurs within limited temperature ranges (see examples below). The relative expansion (also called strain) divided by the change in temperature is called the material's coefficient of thermal expansion and generally varies with temperature.