Atmospheric Pressure
Air has weight · 760 mmHg at sea level · It falls with height
What compressed air is and where it is used
What atmospheric pressure is and why it falls with height
What a barometer and a manometer measure
How a syringe and a pump actually work
Running an air hammer, a drill and a wrench
The air brakes of trains and large vehicles
Firing an air rifle
High level cleaning work
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