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thermal expansion| 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 γ is the fractional increase in volume per degree. To a close approximation, β = 2α and γ = 3α. |
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