When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by it...
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http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms
Thermal expansion is the tendency of matter to change in volume in response to a change in temperature, through heat transfer. Temperature is defined as the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin moving more and usually maintain a greater...
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http://en.wikipedia.org/wiki/Thermal_expansion
A material’s change in volume, area, or length upon heating.
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http://needtoknow.nas.edu/energy/glossary/
the general increase in the volume of a material as its temperature is increased. It is usually expressed as a fractional change in length or volume ... [6 related articles]
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http://www.britannica.com/eb/a-z/t/36
<radiobiology> Characteristic property of most solids and liquids which causes their volume to increase when they are heated. Thermal expansion and contraction can cause structural problems in pulsed fusion devices. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973
A form of mechanical weathering in which heat causes a mineral's crystal structure to enlarge.
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http://www.encyclo.co.uk/local/22291
The property of increasing in volume as a result of an increase in internal temperature.
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http://www.encyclo.co.uk/local/22392
When heated, most objects expand in size. This increases the volume occupied by a given mass of material, decreasing its density and causing it to be buoyant relative to material of the same composition but lower temperature ("hot air rises"). Such differences in density provide the driving force for convective flow within planets.
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http://www.encyclo.co.uk/visitor-contributions.php
The property of increasing in volume as a result of an increase in internal temperature.
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http://www.scientificpsychic.com/etc/geology-glossary.html
The expansion of a material when subjected to heat.
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http://www.youngco.com/young2.asp?ID=4&Type=3
(or contraction) the volume change per unit volume of a substance due to a one degree change in its temperature.
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https://nsidc.org/cryosphere/glossary?page=26
The increase in a linear dimension and volume of a material accompanying a change of temperature.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
An increase in size due to an increase in temperature expressed in units of an increase in length or increase in size per degree, i.e. inches/inch/degree C.
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https://www.encyclo.co.uk/local/20850
Change in unit length per degree change of temperature.
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https://www.encyclo.co.uk/local/21066
Expansion caused by increase in temperature.
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https://www.encyclo.co.uk/local/21122
Expansion that is due to a rise in temperature. It can be expressed in terms of linear, area, or volume expansion. The coefficient of linear expansion α is the fractional increase in length per degree temperature rise; area, or superficial, expansion β is the fractional increase in area per degree; and volume, or cubic, expansion ...
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https://www.encyclo.co.uk/local/21221
The increase in a linear dimension and volume of a material accompanying a change of temperature.
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https://www.metaltek.com/resources/glossary/
The fractional change in length of a material for a unit change in temperature.
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https://www.rayplastics.com/learn-about-thermoforming/terms-definitions/
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