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The fundamental SI unit of pressure is the Pascal (Pa), but it is a small unit so kPa is the most common direct pressure unit for atmospheric pressure.
physics.org page with fascinating facts all about atmospheric pressure. Did you know that you have one tonne of air pressing down on you?
This page from NASA tells you all you need to know about atmospheric pressure. Find out why your ears pop or have a go at flying a hot air balloon.
From the companion website to several recent NOVA programs on Mt. Everest. This page looks at the effects of air pressure at high altitudes.
The boiling point is defined as the temperature at which the saturated vapor pressure of a liquid is equal to the surrounding atmospheric pressure.
An introduction to pressure which discusses various everyday applications and the relationship between pressure and surface area.
A nice demonstration using a simple Coke can of atmospheric pressure.
A nice demonstration using a simple steel drum of atmospheric pressure.
A handy conversion calculator for some common pressure units.
Ever wondered why it hurts so much when someone wearing spiked heels steps on your foot? It's all about pressure.
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