Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
sea-level pressure[′sē ¦lev·əl ‚presh·ər]
The atmospheric pressure at mean sea level, either directly measured or, most commonly, empirically determined from the observed station pressure.
The atmospheric pressure that exists at sea level. It is used as a common reference for analysis of surface-pressure patterns. It can be measured by stations located at sea level or determined from charts showing the station pressure and temperature taken at stations not at sea level. In a standard atmosphere, its value is 29.92 in of mercury, 760 mm, or 1013.2 hectopascals.