air pressure
nounUK /ˈeə ˌpreʃə/
US /ˈer ˌpreʃər/
Air pressure is how hard the air pushes on things around it.
The air pressure in the tire was too low, so we pumped it up.
RELATED WORDS
OTHER MEANINGS
2. The force that air inside a closed space pushes outward on its walls.
The air pressure inside the balloon made it stretch.
3. The weight of the air above a place, which changes with height and weather.
Air pressure is lower on top of a mountain than at the beach.
4. A measurement used in weather reports to help predict rain or sunshine.
The weather map showed high air pressure, so we expected a sunny day.