Joseph B Reid wrote:
>
> Matthew Zetter asked in USMA 23555:
>
> >
> > What society defined standard atmospheric pressure to be 101.325 kPa
> > (I know the value came from 760 torr) and standard gravity to be
> > 9.80665 m/s^2? Is standard room temperature 293.15K or 298.15 K or
> > both? Do any of you know were I could get a thermometer that reads
> > in kelvins.
>
> >
>
> > Thank you for you time.
>
> >
>
> > Matthew Zotter
I'm not certain who defined them but 293.15 K [20 deg C],is the
reference temperature for dimensional measurements - gauge blocks, etc,
and 298.15 K [25 deg C] is the reference temperature for standard
resistors and other electrical standards.
I thikk this has been true since at least 1948 and may go back to the
1930's or earlier.
Carroll Hughes
