"Adrian D. Shaw" wrote in message
...
Felly sgrifennodd John Hall :
In article ,
Adrian D. Shaw writes:
What's the difference between wet bulb and dewpoint?

Dewpoint is the temperature to which the air would have to be cooled to
become saturated, i.e. to have a relative humidity of 100%. Wet bulb
measures the degree of evaporative cooling, so that the lower the
relative humidity the greater the depression of the wet bulb reading
compared to dry bulb. At 100% RH, the dry bulb, wet bulb and dewpoint
will all be the same. For any lower RH, DB WB and, I think, WB DP.

Many thanks; yes I see you're right. There's an interesting graph at:
http://ianrpubs.unl.edu/generalag/g626.htm

This graph shows that the WB temperature could equally well be calculated
from the two variables, temperature and RH. I wonder why my WS doesn't
do that too!

Adrian
--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk

Adrian, thanks for sight of a most informative graph. Interesting also to
see it applied to problems within a pig farm!

I now have to work out how to apply it to the melting ice problem, hopefully
not of concern to the pigs.

Best regards, Roger