atmospheric+air
131air lock — noun Date: 1851 1. an intermediate chamber with two airtight doors or openings to permit passage between two dissimilar spaces (as two places of unequal atmospheric pressure) 2. a stoppage of flow caused by air being in a part where liquid ought… …
132air pressure — the force exerted by air, whether compressed or unconfined, on any surface in contact with it. Cf. atmospheric pressure. [1870 75] * * * …
