What is the scale on a typical barometer?

[D.M. Procida]

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).

Thanks,

Daniele

[Set Square]

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.

[John Horne]

1000 to 1035 should do for this time of year

[Andy Hall]

Probably lower in Wales though, because it's always raining. :-)

.andy

To email, substitute .nospam with .gl

[chriskross]

Ideally you should be using pascals (hPA or kPa).

Chris

[Richard]

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.

Richard.

[chriskross]

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.

Chris

[Michael McNeil]

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.

[The Natural Philosopher]

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 country...

[Huge]

You wanna get yourself a proper operating system, you do;

charon{huge}1360: units you have: hectopascal you want: inch hg * 2.953007e-02 / 3.386379e+01

[Set Square]

Assuming you've got a 30-odd foot high wall to put it on! [And a long ladder].