Talk:Thermal expansion

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There is a "hello!!!!!" at the beginning of the page which doesn't seem to exist in the source text. Can somebody fix this?

i just waaanna aaskk if thoose given with statement are in correct dimension of matter?

Regards, YS

if:

\frac{}{} \epsilon_{thermal} = \alpha \Delta T

is true, and:

\frac{}{}\alpha is the coefficient of thermal expansion in inverse kelvins

is true, thus:

\epsilon_{thermal} \propto \frac{1}{\Delta T}

must be true, then εthermal must be inversely related to ΔT.

Da2ce7 15:55, 30 September 2006 (UTC)

Sorry, but you're wrong. The proportionality is independent of the units on the coefficients. Think of it this way, if the temperature doubles, the thermal strain doubles. Therefore: \epsilon_{thermal} \propto \Delta T - EndingPop 17:47, 2 October 2006 (UTC)

"Polymers expand as much as 10 times more than metals, which expand more than ceramics."

its no where near that much, plastics 60-90, metals 10-30, so 4 times is nearer, comparing a rare high expansion plastic to a rare low expansion metal is misleading. —Preceding unsigned comment added by Asplace (talk • contribs) 13:59, 5 September 2007 (UTC)

"Thermal expansion generally increases with bond energy"

isn't this the wrong way round? Asplace 15:52, 25 May 2007 (UTC)

Do bones expand when heated? Like, does thermal expansion apply to everything? —Preceding unsigned comment added by 169.229.78.148 (talk) 07:10, 4 September 2007 (UTC)

they must, all things do, even if its hidden by other effects or is very small, but bone is a complex and variable material, and people are very temperature stable (2C i'd guess), and the way bones/muscles work will mean a few percent size change won't be a problem anyway. —Preceding unsigned comment added by Asplace (talk • contribs) 15:02, 28 September 2007 (UTC)

but it does make you wonder, if its taken into account when they estimate the size of a person from their cold skeleton? —Preceding unsigned comment added by Asplace (talk • contribs) 15:09, 28 September 2007 (UTC)

[edit] Rewrite

Hi Asplace,

Well done on the rewrite. It motivated me to go through the article editing for style and content. You will notice that I changed some of your text in the process. Feel free to change some back if you disagree; we can discuss as needed. --Slashme 08:25, 28 September 2007 (UTC)


added a couple more things, i ran out of time before, and did change back the first sentence, its a fine point, but its the first sentence that needs to be most 'spot on', by which i mean clear and pedantically correct.

was worried about no citations but some of this basic stuff is very often not really stated directly.

i left the whole section about 'state equation' but do think its a bit over the top and basically BS, in that its a lot of frightening maths for a very small point, how do you feel about loosing it or simplifying and dropping it down the bottom? Asplace 14:36, 28 September 2007 (UTC)