Piano On Ice.

[Terry Beckingham]

At 18:43 10/19/97 -0700, you wrote:
>Glenn wrote:
>> 
>> -----Original Message-----
>> From: JIMRPT@aol.com <JIMRPT@aol.com>
>> To: pianotech@ptg.org <pianotech@ptg.org>
>> Date: Sunday, October 19, 1997 5:08 PM
>> Subject: Re: Re: Piano On Ice.
>> 
>> >
>> >In a message dated 10/19/97 6:46:05 PM, you wrote:
>> >
>> ><<The part about the dew point equaling the RH is not at all true . . . but
>> >don't ask me the formula!!!>>
>> >
>> >Dew Point @ air temperature = relative humidity =saturated atmosphere or
>> >"fog", dew forms on still surfaces also..............I'm positive about
>> this,
>> >I think.  :-)
>> >Jim Bryant (FL)
>> >Dew Bee Dew Bee Doo= Wet Bee
>> >
>> 
>> What I am saying is that the NUMBER is never the same.  When the temp is,
>> lets say 80 (or whatever) and the dew point is 40 the relative humidity is
>> NOT 40 !  I would like to know the relationship and/or formula.
>> 
>> Glenn.
>Hi Glenn,
>         Terry and I are saying the same thing, although he has managed
>to be a little more clear.
> At temperatures above freezing the only variable is atmosperic pressure
>or altitude,once fog is in evidence you have passed 100% RH and the
>water has changed from vapour into droplets.Hence the term dew point.
>The ice crystals at low temperatures is usually caused by the mixing of
>warmer air with cold, it sure looks pretty in this part of the world.
>In this part of the world at -40 breath out and you can create your own
>mini snow storm sneeze and its a blizzard.
>Regards Roger


When you see an aeroplane take off from an airport with a temperatur of -40,
the exhaust from the engines creates instant ice fog and often closes down
the airport for a considerable length of time. I know, I worked on an
airport for over 30 years.

I don't know what the formula would be for figuring out the relationship
between temperature dewpoint and RH. We had tables to refer to, so we didn't
worry about formulae. 

Terry