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Many thanks to all.<div><br></div><div>A night's sleep and some clear explanations have helped greatly.</div><div><br></div><div>Cheers</div><div><br></div><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="">David King</div><div style="">Physics HoD</div><div style="">Christ's College</div><div style="">Private Bag 4900</div><div style="">Christchurch</div><div style="">New Zealand</div><div style="font-size: 12px; "><br class="khtml-block-placeholder"></div><div style="font-size: 12px; "><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div><br><div><div>On 9/05/2008, at 8:21 AM, Bryden, Francis wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">Hi David</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">The way I think of it is……….</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">The temperature of the air (and the thermal energy your skin loses to it ) depends on the kinetic energy of the randomly moving particles.</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">In warm air the particles have greater KE and so the skin loses less thermal energy because there is a smaller temperature gradient.</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">I suspect the KE of the airparticles due to the wind is small compared with the KE due to their normal random motion.</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">(Wind has no effect on the temperature of a thermometer. Point a fan at a thermometer and the effect is negligible.)</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> Wind has two effects on us.</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> We are usually warmer than the air, and there is a layer of warm air near our skin that we have heated up, this will keep us warm. Any wind will move this warm layer away.</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">Because we sweat, wind will also cool us as it increases the rate of evaporation, taking thermal energy from our skin</font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); ">Thanks<span class="Apple-converted-space"> </span><i>................ Francis</i></font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+1" color="#000080" style="font-family: 'Times New Roman'; font-size: 15pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>Francis Bryden</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>HoD Physics</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>St Cuthbert's College</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>122 Market Rd or Box 26 020</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>Epsom Epsom</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>Auckland 1051 Auckland 1344</i></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>New Zealand New Zealand</i></font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+1" color="#000080" style="font-family: 'Times New Roman'; font-size: 15pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 128); "><i>ph: 63 9 5204159 ext 7808</i></font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+1" color="#000080" style="font-family: 'Times New Roman'; font-size: 15pt; color: rgb(0, 0, 128); "> </font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000080" style="font-family: Arial; font-size: 10pt; color: rgb(0, 0, 128); "><i><a href="mailto:fbryden@stcuthberts.school.nz">fbryden@stcuthberts.school.nz</a></i></font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 12pt; color: rgb(0, 0, 0); ">-----Original Message-----</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 12pt; color: rgb(0, 0, 0); "><b>From:</b><span class="Apple-converted-space"> </span><a href="mailto:phys-teach-talk-bounces@nzip.org.nz">phys-teach-talk-bounces@nzip.org.nz</a> [<a href="mailto:phys-teach-talk-bounces@nzip.org.nz" target="_blank">mailto:phys-teach-talk-bounces@nzip.org.nz</a>]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b></font><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); ">David Housden</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>Sent:</b><span class="Apple-converted-space"> </span>Friday, 9 May 2008 6:59 a.m.</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>To:</b><span class="Apple-converted-space"> </span><a href="mailto:phys-teach-talk@nzip.org.nz">phys-teach-talk@nzip.org.nz</a></font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>Subject:</b><span class="Apple-converted-space"> </span>FW: warm and cold winds</font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><div align="left" style="text-align: left; "><font face="Calibri" size="+0" color="#1F497D" style="font-family: Calibri; font-size: 11pt; color: rgb(31, 73, 125); ">Hi all</font></div><br><div align="left" style="text-align: left; "><font face="Calibri" size="+0" color="#1F497D" style="font-family: Calibri; font-size: 11pt; color: rgb(31, 73, 125); ">I’m not sure this actually got sent to everyone so I will resend on David King’s behalf.</font></div><br><div align="left" style="text-align: left; "><font face="Calibri" size="+0" color="#1F497D" style="font-family: Calibri; font-size: 11pt; color: rgb(31, 73, 125); ">Cheers</font></div><br><div align="left" style="text-align: left; "><font face="Calibri" size="+0" color="#1F497D" style="font-family: Calibri; font-size: 11pt; color: rgb(31, 73, 125); ">David Housden</font></div><br><div align="left" style="text-align: left; "><font face="Calibri" size="+0" color="#1F497D" style="font-family: Calibri; font-size: 11pt; color: rgb(31, 73, 125); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 12pt; color: rgb(0, 0, 0); "><b>From:</b></font><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><span class="Apple-converted-space"> </span><a href="mailto:phys-teach-talk-bounces@nzip.org.nz">phys-teach-talk-bounces@nzip.org.nz</a> [<a href="mailto:phys-teach-talk-bounces@nzip.org.nz" target="_blank">mailto:phys-teach-talk-bounces@nzip.org.nz</a>]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>David King</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>Sent:</b><span class="Apple-converted-space"> </span>Thursday, 8 May 2008 11:01 p.m.</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>To:</b><span class="Apple-converted-space"> </span>PHYSICS TALK</font></div><div align="left" style="text-align: left; "><font face="Tahoma" size="+0" color="#000000" style="font-family: Tahoma; font-size: 10pt; color: rgb(0, 0, 0); "><b>Subject:</b><span class="Apple-converted-space"> </span>warm and cold winds</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Can someone help?</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">I got myself in a bit of a confuddle yesterday trying to answer a pupils question.</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">"Sir, why, if temperature is to do with Kinetic Energy is wind cold?"</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">I started on evaporation from the skin etc and the idea of us 'feeling' cold, when he asked</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">"Why do we have warm winds? What's the difference?"</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">I started to answer then stopped. What makes air particles travelling at whatever kph warm or cold?</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Cheers</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">David King</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">Physics HoD</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">Christ's College</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">Private Bag 4900</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">Christchurch</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); ">New Zealand</font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Helvetica" size="-1" color="#000000" style="font-family: Helvetica; font-size: 9pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">No virus found in this incoming message.</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Checked by AVG.</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Version: 7.5.524 / Virus Database: 269.23.9/1419 - Release Date: 7/05/2008 7:46 a.m.</font></div><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "></font></div><br><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">No virus found in this outgoing message.</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Checked by AVG.</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">Version: 7.5.524 / Virus Database: 269.23.10/1421 - Release Date: 7/05/2008 5:23 p.m.</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "></font></div><br><div align="left" style="text-align: left; "><font face="Arial" size="+0" color="#000000" style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 0); "> </font><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); "> </font></div><br clear="all"><hr noshade="" size="1" width="100%" color="#000000" style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); visibility: visible; margin-top: 0px; "><br><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">This message (and any associated files) is intended only for the</font></div><div align="left" style="text-align: left; "><font face="Times New Roman" size="+0" color="#000000" style="font-family: 'Times New Roman'; font-size: 12pt; color: rgb(0, 0, 0); ">use of the individual or entity to which it is addressed and may</font></div><div align="left" style="text-align: left; 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