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 Subject: I only need answer please! help! Category: Reference, Education and News > Education Asked by: wyzgowski7-ga List Price: $2.00 Posted: 24 May 2005 10:46 PDT Expires: 23 Jun 2005 10:46 PDT Question ID: 525067  What is the length of an aluminum rod at 65 C if it's length at 15 C is 1.2 meters?  Answer  Subject: Re: I only need answer please! help! Answered By: welte-ga on 24 May 2005 19:25 PDT Rated:  Hi, The thermal expansion coefficient for Aluminum is 2.31 x 10^-5, referred to as alpha (or a below). The formula for linear expansion of solids is \delta L = aL\delta T = 2.31 x 10^-5 * 1.2m * (65C-15C) =0.001386m This is the amount by which the length increases, which is very small compared to 1.2 meters. The new length would be 1.201386m Here's a description of a lab on thermal expansion, with equations: http://phoenix.phys.clemson.edu/labs/223/expansion/ Here's a page about Aluminum, along with physical constants: http://www.efunda.com/materials/elements/element_info.cfm?Element_ID=Al Here is a page describing thermal expansion: http://irc.swan.ac.uk/ThExpansion.htm -welte-ga  wyzgowski7-ga rated this answer: and gave an additional tip of:$10.00 Thank you very much you were very helpful, I am very grateful!!!!