A	FDA	C106039	FDA CDRH GUDID Terminology	C128461	Inches of Mercury		A measurement of the pressure exerted by a column of mercury of 1 inch in height at the standard acceleration of gravity. This measurement is used for barometric pressure in aviation, refrigeration, and weather reports. The conversion to metric units is dependent upon the temperature of the mercury.	A measurement of the pressure exerted by a column of mercury of 1 inch in height at the standard acceleration of gravity. This measurement is used for barometric pressure in aviation, refrigeration, and weather reports. The conversion to metric units is dependent upon the temperature of the mercury.
A	FDA	C106039	FDA CDRH GUDID Terminology	C49670	Millimeter of Mercury		A non-SI unit of pressure equal to 133,332 Pa or 1.316E10-3 standard pressure. Use of this unit is generally deprecated by ISO or IUPAC.	A non-SI unit of pressure equal to 133,332 Pa or 1.316E10-3 standard atmosphere. Use of this unit is generally deprecated by ISO and IUPAC.