Answer:
the force you produce when you press something:
He put too much pressure on the door handle and it snapped.
You can stop bleeding by applying pressure close to the injured area.
the force that a liquid or gas produces when it presses against an area:
gas/water pressure
The new material allows the company to make gas pipes which withstand higher pressures.
The gas is stored under pressure (= in a container which keeps it at a higher pressure than it would usually have).
