Thermal Expansion

Over small temperature ranges, the linear nature of thermal expansion leads to expansion relationships for length, area, and volume in terms of the linear expansion coefficient .


Table of expansion coefficients
Index

Expansion concepts
 
HyperPhysics***** Thermodynamics R Nave
Go Back





Linear Expansion

The relationship governing the linear expansion of a long thin rod can be reasoned out as follows:


Expansion conceptsCalculation
Index
 
HyperPhysics***** Thermodynamics R Nave
Go Back





Linear Expansion

Over small temperature ranges, the fractional thermal expansion of uniform linear objects is proportional the the temperature change. Several equivalent forms of the relationship find use. The calculation is set up in the form

Length change = Original length x alpha x delta T

Common forms

A length change ΔL = m will occur
for an object of original length L0 = m and
expansion coefficient = x10^ /C.
Original temperature = C = F
Final temperature = C = F
Note: This calculation is set up with default values corresponding to heating a 10 meter bar of steel by 20 °C. Any of the values may be changed. The final calculation is done by clicking on the quantity you wish to calculate in the active expression above.
Index
 
HyperPhysics***** Thermodynamics R Nave
Go Back





Expansion Concepts


How to loosen a jar lid
Index
 
HyperPhysics***** Thermodynamics R Nave
Go Back