Thermal Expansion

Wednesday, 2 May 2018

9:17 PM

Length Expansion

 

Where

 = change in length (m)

 = coefficient of linear expansion ( or )

 = initial length (m)

 = change in temperature (°C or K)

 

Area Expansion

 

 

Volume Expansion

 

Where

 = Change in volume

 = coefficient of linear expansion

 = initial volume

 = change in temperature

 = coefficient of volume expansion

 

 

 

 

Machine generated alternative text: Expansion rate depends on material Table 19.1 Average Expansion Coefficients for Some Materials Near Room Temperature 10—6 10—4 10 6 10 4 10-6 10-6 10 6 10—4 10—6 10—6 10—4 10—6 10-3 10—3 Material Aluminum Brass and bronze Copper Glass (ordinary) Glass (Pyrex) Lead Steel Invar (Ni—Fe alloy) Concrete Average Linear Expansion Coefficient 24 x 19 x 17 x 3.2 x 29 x 11 x 0.9 x 12 x Material Alcohol, ethyl Benzene Acetone Glycerin Mercury Turpentine Gasoline Aira at OOC Heliuma Average Volume Expansion Coefficient 1.12 x 1.24 x 1.5 x 4.85 x 1.82 x 9.0 x 9.6 x 3.67 x 3.665 x a Gases do not have a specific value for the volume expansion coefficient because the amount of expan- sion depends on the type of process through which the gas is taken. The values given here assume that the gas undergoes an expansion at constant pressure.

 

 

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