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<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff size=2>Hi
all</FONT></SPAN></DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff size=2>The
following website quantifies Francis's statement that the KE of the air
particles due to the wind is small compared with the KE due to their random
motion:</FONT></SPAN></DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff size=2><A
href="http://www.rwc.uc.edu/koehler/biophys.2ed/diffusion.html">http://www.rwc.uc.edu/koehler/biophys.2ed/diffusion.html</A></FONT></SPAN></DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff size=2>Wind
velocity might be ~10 m / s. Random velocity of air particles is ~ 500 m / s.
</FONT></SPAN></DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN><SPAN class=508063821-08052008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff size=2>There
is also rotational and vibrational energy stored in molecules; for a diatomic
molecule such as nitrogen this accounts for approximately half the molecule's
energy.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2>Cheers</FONT></SPAN></DIV>
<DIV><SPAN class=508063821-08052008><FONT face=Arial color=#0000ff
size=2>Peter</FONT></SPAN></DIV>
<DIV
align=left><!--StartFragment -->--------------------------------------------------------<BR>Peter
Gilberd<BR>Deputy Manager, Research Funding<BR>The Royal Society of New
Zealand<BR>PO Box 598, Wellington 6140, New Zealand.<BR>Telephone (direct dial):
+64-4-470 5778<BR>Telephone (exchange): +64-4-472 7421<BR>Fax: +64-4-473
1409<BR>Email: peter.gilberd@rsnz.org<BR>The Gateway to NZ Science<BR><<A
href="http://www.rsnz.org/"
eudora="autourl">http://www.rsnz.org</A>><BR>--------------------------------------------------------</DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
phys-teach-talk-bounces@nzip.org.nz
[mailto:phys-teach-talk-bounces@nzip.org.nz] <B>On Behalf Of </B>Bryden,
Francis<BR><B>Sent:</B> Friday, 9 May 2008 8:22 a.m.<BR><B>To:</B> David
Housden; phys-teach-talk@nzip.org.nz<BR><B>Subject:</B> RE: warm and cold
winds<BR><BR></FONT></DIV>
<DIV>
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<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hi
David</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The way I think of it
is……….</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The temperature of
the air (and the thermal energy your skin loses to it ) depends on the kinetic
energy of the randomly moving particles.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">In warm air the
particles have greater KE and so the skin loses less thermal energy because
there is a smaller temperature gradient.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I suspect the KE of
the airparticles due to the wind is small compared with the KE due to their
normal random motion. </SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">(Wind has no effect
on the temperature of a thermometer. Point a fan at a thermometer and the
effect is negligible.)</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> Wind has two
effects on us.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"> 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.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Because we sweat,
wind will also cool us as it increases the rate of evaporation, taking thermal
energy from our skin</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks <EM><I><FONT
face=Arial><SPAN style="FONT-FAMILY: Arial">................
Francis</SPAN></FONT></I></EM></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Francis
Bryden</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">HoD
Physics</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">St Cuthbert's
College</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">122 Market
Rd
or Box 26 020</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Epsom Epsom</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Auckland
1051
Auckland 1344</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">New
Zealand New
Zealand</SPAN></FONT></I></EM></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">ph: 63 9 5204159 ext
7808</SPAN></FONT></I></EM></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><A
href="mailto:fbryden@stcuthberts.school.nz"><EM><I><FONT face=Arial
color=navy><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; TEXT-DECORATION: none">fbryden@stcuthberts.school.nz</SPAN></FONT></I></EM></A></SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B>
phys-teach-talk-bounces@nzip.org.nz
[mailto:phys-teach-talk-bounces@nzip.org.nz] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B></SPAN></FONT><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">David
Housden</SPAN></FONT><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, 9 May 2008 6:59
a.m.<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> </SPAN></FONT><FONT
face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">phys-teach-talk@nzip.org.nz</SPAN></FONT><FONT
face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> FW: warm and cold
winds</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Calibri color=#1f497d
size=2><SPAN lang=EN-NZ
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">Hi
all</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Calibri color=#1f497d
size=2><SPAN lang=EN-NZ
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">I’m not sure
this actually got sent to everyone so I will resend on David King’s
behalf.</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Calibri color=#1f497d
size=2><SPAN lang=EN-NZ
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">Cheers</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Calibri color=#1f497d
size=2><SPAN lang=EN-NZ
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri">David
Housden</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Calibri color=#1f497d
size=2><SPAN lang=EN-NZ
style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: Calibri"></SPAN></FONT> </P>
<DIV>
<DIV
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<P class=MsoNormal style="MARGIN-LEFT: 36pt"><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
phys-teach-talk-bounces@nzip.org.nz
[mailto:phys-teach-talk-bounces@nzip.org.nz] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>David King<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, 8 May 2008 11:01
p.m.<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> PHYSICS
TALK<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> warm and cold
winds</SPAN></FONT></P></DIV></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">Can someone
help?</SPAN></FONT></P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">I got myself in a bit of a
confuddle yesterday trying to answer a pupils
question.</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">"Sir, why, if temperature is
to do with Kinetic Energy is wind cold?"</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">I started on evaporation from
the skin etc and the idea of us 'feeling' cold, when he
asked</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">"Why do we have warm winds?
What's the difference?"</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">I started to answer then
stopped. What makes air particles travelling at whatever kph warm or
cold?</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN lang=EN-NZ style="FONT-SIZE: 12pt">Cheers</SPAN></FONT></P></DIV>
<DIV>
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