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# Can coefficient of linear expansion be negative?

Updated: 12/2/2022

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Q: Can coefficient of linear expansion be negative?
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### What is the cubical coefficient of thermal expansion for metals?

Since most metals are isotropic, the cubical coefficient of expansion is three times the linear coefficient of expansion. The linear coefficient of expansion is obtained from measurement and tables for the specific material which are readily available.

### Does the coefficient of linear expansion depends upon length?

yes,according to relation coefficient of linear expansion depends upon original length.

### Linear expansion apparatus?

A linear expansion apparatus is used to measure the change in length of a material in response to a change in temperature. It typically consists of a sample material mounted between two supports, with a mechanism to control the temperature. By measuring the change in length as the temperature changes, the coefficient of linear expansion of the material can be determined.

nickel

### What is the coefficient of linear expansion of mercury?

The coefficient of linear expansion of mercury is 0.000181 per degree Celsius.

### Why is it necessary to know the coefficient of linear expansion of solids?

By knowing the coefficient of linear expansion of solids, you can determine how a solid reacts to temperature. Everything reacts to thermal expansion. For instance, a concrete bridge expands when hot, and with the formula for expansion and the coefficient for it, you know just how much that concrete expands and you can plan and build accordingly. That saves lives.

### Coefficient of thermal expansion for aluminum in imperial?

http://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html

### The thermal linear expansion coefficient is positive when the material expands do you expect it be negative when the material contracts?

The coefficient remains positive, but the dT used will become negative, yielding a negative growth (ie, a contraction). See the equation below: dx = L * a * (Tactual - Tref) Where, L is the starting length a is the thermal expansion coefficient Tactual is the temperature you're evaluating at Tref is the reference (or starting) temperature If Tactual &lt; Tref, then the quantity (Tactual - Tref) &lt; 0

### What is the thermal expansion coefficient for monel?

Thermal expanasion coefficient fro monel is 0,0000075 m/m&ordm;C. More info at http://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html

### Why are railroad tracks built with a flexible expansion and contraction joint?

The tracks have a larger coefficient of linear expansion than the ground beneath.

### Does the coefficient of linear expansion depend upon length describe?

The coefficient of linear expansion DOES not depend on the length. Each material has a certain value for its coeeficient of linear expansion. The length of the material dictates how much it will expand linearly for a given rise in temperature. L" = L'(1 + a x (T'' - T')) That is the length at temperature T'' which is higher than temperature T' is given by the length L' at temperature T' multiplied by the quantity [1 + a x (T" - T')], where a is the coefficient of linear expansion which is constant for a given material. Thus if the temperature difference T" - T' is large then the expansion will be large which means L" - L' will be large. Likewise if the original length L' is large, then the corresponding expanded length L" will be large

### Why is a bimetallic strip curve when it is heated or cooled?

Because the two metals have different coefficient of linear expansion