<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"/>  <style>  </style>  </head> <body bgcolor=white lang=EN-US link=blue vlink=blue> <div class=Section1> Hey, its been 35 years since my engineering classes and my brain is getting foggy. So I did a tiny bit of research to make sure I was on the right track. It is important to distinguish between heat and temperature. <o:p></o:p> <o:p> </o:p> From Wikipedia (http://en.wikipedia.org/wiki/Heat): <o:p></o:p> In <a href="http://en.wikipedia.org/wiki/Physics" title=Physics style='text-decoration: initial;orphans: 2;text-align:start;widows: 2;-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;background-position:initial initial;background-repeat: initial initial;word-spacing:0px'>physics</a> and <a href="http://en.wikipedia.org/wiki/Chemistry" title=Chemistry style='text-decoration: initial;orphans: 2;text-align:start;widows: 2;-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;background-position:initial initial;background-repeat: initial initial;word-spacing:0px'>chemistry</a>, heat is <a href="http://en.wikipedia.org/wiki/Energy" title=Energy style='text-decoration: initial;orphans: 2;text-align:start;widows: 2;-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;background-position:initial initial;background-repeat: initial initial;word-spacing:0px'>energy</a> transferred from one body to another by thermal interactions.<a href="http://en.wikipedia.org/wiki/Heat#cite_note-1" style='text-decoration: initial;background-position:initial initial;background-repeat:initial initial'>[1]</a><a href="http://en.wikipedia.org/wiki/Heat#cite_note-Kittel_and_Kroemer_1980-2" style='text-decoration:initial;background-position:initial initial;background-repeat: initial initial'>[2]</a> The transfer of energy can occur in a variety of ways, among them <a href="http://en.wikipedia.org/wiki/Heat_conduction" title="Heat conduction" style='text-decoration:initial;orphans: 2;text-align:start;widows: 2; -webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;background-position: initial initial;background-repeat:initial initial;word-spacing:0px'>conduction</a>,<a href="http://en.wikipedia.org/wiki/Heat#cite_note-3" style='text-decoration: initial;background-position:initial initial;background-repeat:initial initial'>[3]</a> radiation,<a href="http://en.wikipedia.org/wiki/Heat#cite_note-4" style='text-decoration: initial;background-position:initial initial;background-repeat:initial initial'>[4]</a> and <a href="http://en.wikipedia.org/wiki/Convective_heat_transfer" title="Convective heat transfer" style='text-decoration:initial;orphans: 2; text-align:start;widows: 2;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px; background-position:initial initial;background-repeat:initial initial; word-spacing:0px'>convection</a>. Heat is not a property of a system or body, but instead is always associated with a process of some kind, and is synonymous with heat flow and heat transfer.<o:p></o:p> <o:p> </o:p> Heat is the measure of kinetic energy transfer between bodies, it is not a measure of the kinetic energy of the molecules that you describe (even though they use the same units of energy to describe them), unless we are going to extract some of that kinetic energy and transfer it to another body. For a given sum of kinetic energy of moving molecules, depending on their mass, we can calculate the temperature. We could theoretically extract the kinetic energy from those moving molecules in the form of heat and transfer that energy to another body. Depending on the 2nd body’s mass and specific heat we could predict what its final temperature would be for a given infusion of heat energy. <o:p></o:p> <o:p> </o:p> We get heat from the sun, even though there are no molecules in space to transfer it. Heat is pure energy transferred between bodies. Apply a given amount of heat to low mass molecules, such as helium, and they will move proportionally faster and thus be hotter in temperature than the same amount of heat applied to a carbon molecule. <o:p></o:p> <o:p> </o:p> At least that is my understanding, and I’ve been wrong before. <o:p></o:p> <o:p> </o:p> <div> Dean<o:p></o:p> Dean W May                (812) 235-5272 voice and text <o:p></o:p> PianoRebuilders.com    (888) DEAN-MAY        <o:p></o:p> <ST1:PLACE u1:st="on"><u4:CITY u1:st="on"><u2:place u3:st="on"><u2:City u3:st="on"><st1:place w:st="on"><st1:City w:st="on">Terre Haute</st1:City></u2:place></st1:place></u4:CITY> <U2:STATE u1:st="on"><u2:State u3:st="on"><st1:State w:st="on">IN</u2:State></u2:State></U2:STATE></st1:State> <U2:POSTALCODE u1:st="on"><u2:PostalCode u3:st="on"><st1:PostalCode w:st="on">47802</u2:PostalCode></u2:PostalCode></U2:POSTALCODE></st1:PostalCode></st1:place><o:p></o:p> </div> </ST1:PLACE> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of David Boyce Sent: Tuesday, December 11, 2012 2:27 PM To: pianotech@ptg.org Subject: Re: [pianotech] Protection from underfloor heating.<o:p></o:p> </div> <o:p> </o:p> Dean, may I gently and respectfully suggest that you may be a bit mistaken in your understanding of what heat is?  Heat is a measure of total kinetic energy of molecules.  It is not a "thing" in its own right. Best regards, David.<o:p></o:p> <div> On 11/12/2012 19:00, <a href="mailto:pianotech-request@ptg.org">pianotech-request@ptg.org</a> wrote:<o:p></o:p> </div> <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' cite="mid:mailman.2.1355252402.5318.pianotech@ptg.org" type=cite><pre wrap="">Radiant heat works not by warming the air, though there is some of that, but<o:p></o:p></pre><pre>by radiating the heat, duh. ;-) Objects with mass in view of the radiant<o:p></o:p></pre><pre>heat source absorb the heat and began to warm in temperature. The closer the<o:p></o:p></pre><pre>object to the source, the more heat is absorbed. A piano with lots of mass<o:p></o:p></pre><pre>sitting very close to the source will absorb lots of heat. While air, with<o:p></o:p></pre><pre>negligible mass, will not absorb much heat. So measuring the air's<o:p></o:p></pre><pre>temperature will not be any kind of indicator as to how much heat the piano<o:p></o:p></pre><pre>is getting.<o:p></o:p></pre></blockquote> <o:p> </o:p> </div> </body> <a></a>No virus found in this message. Checked by AVG - <a href='http://www.avg.com'>www.avg.com</a> Version: 2012.0.2221 / Virus Database: 2634/5452 - Release Date: 12/11/12 </html>