Barometers

If you think of the 'weight' of air above your head that is Absolute Pressure which is what a barometer actually understands, but the air above you at sea-level is much more than if you were on
a mountain top !
All meteorological equipment is calibrated at sea-level (It was all part of the Navy to start with !)
This is called Pressure Relative.

beteljuices 'fun' - 'In the parish' virtual barograph. It works ! - trend: /hr
Currently ??? on local (??s since last update)
- data from KomokaWeather Station in Ontario, Canada

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