I don't have one to hand right now, but I'm helping a child make a
weather chart, and I'd like to know what sort of scale I should employ
on the chart (data will be read from Cardiff, in February, if that will
help narrow down the likely range at all).
Depends what units you are using. If you are working in milli-bars - where
1000 mB equals "standard" atmospheric pressure, your scale needs to go from
about 940 to 1060. If you're working in inches of mercury, you need to go
from about 27.5 to 31.
A typical range for a barometer is 930 to 1060 . The units previously being
called millibars but our euro masters have now decreed that they be re-named
hecto-Pascals. Good grief is there no end to their meddling ?
FWIW in Aviation standard pressure 1013.2 when referring to flight levels.
It's got nothing to do with our 'euromasters'. It's the standard SI units
(and it's 'hectopascal'). Take a look at the various electronic weather
stations (produced by Far Eastern companies). They all offer hPa.
You might get direct comparisons of millibars/hectopascals with inches
on Google. You can also find them on uk.sci.weather.
If you want to make her one with a garden hose pipe and water, use a
transparent tube and wallpaper with squares on.
Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
Thats what mine does (aneroid) and it the 50 years I have had it (or
rather, its been in the families and then my, possesion), its never been
NEAR either end. I'd say 28.5-30.5 is all you will ever see in this
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