atmospheric pressure

US /ˌæt.məsˈfer.ɪk ˈpreʃ.ər/
UK /ˌæt.məsˈfer.ɪk ˈpreʃ.ər/
"atmospheric pressure" picture
1.

the pressure exerted by the weight of the atmosphere

:
High atmospheric pressure usually indicates clear skies.
The barometer measures changes in atmospheric pressure.