Linear temperature expansion - online calculator
When an object is heated or cooled, its length changes by an amount proportional to the original length and the change in temperature. The linear thermal expansion of an object can be expressed as
dl = L0 α (t1 - t0) (1)
dl = change in object length (m, inches)
L0 = initial length of object (m, inches)
α = linear expansion coefficient (m/moC, in/inoF)
t0 = initial temperature (oC, oF)
t1 = final temperature (oC, oF)
Note! - linear expansion coefficients for most materials varies with temperature.
For wider temperature ranges - calculate for smaller spans and integrate the results.
Online Thermal Linear Expansion Calculator
Linear Temperature Coefficients - α - for some common metals
- aluminum : 0.000023 (m/moC)
- steel: 0.000012 (m/moC)
- copper: 0.000017 (m/moC)
- more coefficients ..
- more metals ..
Example - Expansion of an Aluminum Beam
An aluminum construction is designed for temperatures ranging -30oC to 50oC. If a beam's length is 6 m when assembled at 20oC - the shortest length of the beam at minimum temperature -30oC can be calculated as
dl = (6 m) + (6 m) (0.000023 m/moC) ((-30 oC) - (20 oC))
= 5.993 m
The longest length of the beam at maximum temperature 50oC can be calculated as
dl = (6 m) + (6 m) (0.000023 m/moC) ((50 oC) - (20 oC))
= 6.004 m
The amount by which a unit area of a material increases when the temperature is raised by one degree is called the coefficient of superficial (area) expansion.
The amount by which a unit volume of a material increases when the temperature is raised by one degree is called the coefficient of cubic expansion.
- en: thermal temperature expansion linear coefficient calculator formula equation
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