>Date: Tue, 20 Nov 2001 22:15:46 +1100
>From: Tim Stevenson <tims@xxxxxxxxxx>
>To: James Kelly <J.Kelly@xxxxxxxxxx>
>Subject: Re: Spreadsheet & Remote Data Servers
The above message contained the following:
> I'll think you will find that what is happening is that when you subtract two
> data items which have OffsetUnits the resulting data interval is given the
> base unit without the offset. Degrees C are represented as an OffsetUnit from
> degrees kelvin. When getting a temperature interval of two values in degree
> C the resulting data value will have the absolute unit which is Kelvin. Thus
> degree C - degree C results in an interval measured in degree K. In your case
> the interval is always 0 degrees K which gets converted to -273.15 degC when
> it is displayed.
This is exactly right. The computed values are temperature *intervals* of 0
kelvins, which
are -273.15 degrees Celsius.
Regards,
Steve Emmerson <http://www.unidata.ucar.edu>
