noun
: standard pressure usually taken to be equal to that of a column of mercury 760 millimeters in height, the mercury being 0° C and gravity being that at 45 degrees latitude : one atmosphere
noun
: standard pressure usually taken to be equal to that of a column of mercury 760 millimeters in height, the mercury being 0° C and gravity being that at 45 degrees latitude : one atmosphere
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012