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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.


What is the relation between the coefficient of linear and superficial and volume expansion respectively?

The coefficient of linear expansion (α) is one-third of the coefficient of superficial expansion (β), and the coefficient of superficial expansion is one-third of the coefficient of volume expansion (γ). This relationship follows from the dimensional analysis of the expansion coefficients in the respective directions.


Does the coefficient of linear expansion depends upon length?

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


What is the relationship of coefficient linear expansion to actual expansion?

The coefficient of linear expansion is a constant value that quantifies how much a material expands per degree Celsius increase in temperature. The actual expansion of an object can be calculated by multiplying the coefficient of linear expansion by the original length of the object and the temperature change.


A material has a coefficient of volume expansion of 60×10^-6/degree celsius. What is its coefficient of expansion?

The coefficient of volume expansion is the triple of the linear expansion coefficient. So with a volume expansion coefficient of 60×10^-6/°C, the linear expansion coefficient would be 20×10^-6/°C.


What is the coefficient of linear expansion of mercury?

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


Does coefficient of linear expansion depend on length?

No, the coefficient of linear expansion does not depend on the initial length of the material. It is a material property that remains constant regardless of the length.


What material has the highest coefficient of linear thermal expansion?

nickel


Coefficient of thermal expansion for aluminum in imperial?

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


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.


What is meant by the cofficient of linear and superficial expansion?

The coefficient of linear expansion measures how much a material expands in length when heated, while the coefficient of superficial expansion measures how much a material expands in area when heated. Both coefficients are used to quantify how materials respond to changes in temperature.


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 < Tref, then the quantity (Tactual - Tref) < 0