> I should instead write 59 ±2°C, since that is the most precision
> I can possibly know it to. With some advanced measuring techniques
> it *may* be acceptable to write 59.43 ±2°C *at most*, and then only
> if you really know why you need the extra information.
It's easy to conceive of a device which, for whatever reason, gives
an "absolute" reading accurate ±2°C, but which tracks temperature
changes somewhat more accurately. And hence a small difference
between successive readings still has significance. A real-world
example is a mercury thermometer in which the glass has been
physically shifted relative to an adjacent scale. So 18°C reads as
20°C, etc.
Cheers,
Phil
---------------------------------------------
Phil Randal
Network Engineer
Herefordshire Council
Hereford, UK
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