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kasnay

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In summary, the unit discussed is micrometers per millikelvin and represents absolute thermal expansion for a fixed length. This unit may be 'cancelled' for mathematical purposes, but it helps to make sense of the underlying information. Dimensional analysis is a useful method for checking the validity of answers, especially in unfamiliar situations.

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kasnay

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Baluncore

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So that would be an absolute thermal expansion for a fixed length, not as a proportion of length.

- #3

Dullard

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Simplifying ('cancel' the meters), it's just a ratio of expansion per degK (in one dimension)

- #4

kasnay

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- #5

Dullard

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The thermal expansion coefficient is a measure of how much a material's dimensions will change when its temperature changes. It is typically represented by the symbol α and is expressed in units of length per unit temperature.

The units m/mK stand for meters per meter per Kelvin. This unit is used to represent the thermal expansion coefficient and indicates the amount of length change per unit length, per unit change in temperature.

The thermal expansion coefficient can be measured by subjecting a material to different temperatures and measuring the resulting change in length or volume. This can be done using specialized equipment such as a dilatometer or by using mathematical equations to calculate the coefficient based on known properties of the material.

The thermal expansion coefficient is important because it affects the dimensional stability of materials when they are exposed to changes in temperature. This can have practical implications in various industries, such as construction, where materials need to be able to withstand temperature changes without warping or breaking.

The thermal expansion coefficient varies between materials and can be influenced by factors such as the material's chemical composition, crystal structure, and temperature range. Generally, materials with stronger bonds between atoms, such as metals, tend to have lower thermal expansion coefficients compared to materials with weaker bonds, such as polymers.

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