Millimeeter elavhõbedasammast (tähis mmHg) on ülerõhu rõhuühik, mis on määratletud kui rõhk, mida avaldab 1 millimeetri kõrgune vertikaalne vedelikusammas, mille tihedus on 13,595 1 g/cm³ ja mis asub standardse raskuskiirenduse väärtusega 980,665 cm/s² mõjuväljas, ja mis vastab ligikaudu 133,322 paskalile (Pa). Kokkuleppelist ühikut millimeeter elavhõbedasammast kasutatakse laialdaselt meditsiinis vererõhu mõõtmiseks (sfügmomanomeetrite abil) ja silmasisese rõhu mõõtmiseks.
A conventional millimetre of mercury (symbol mmHg) is a manometric unit of pressure defined as the pressure exerted by a 1-millimetre-high vertical column of fluid with a conventional density of 13,595 1 g/cm³ under standard gravity (980,665 cm/s²), and it equals approximately 133.322 Pa (pascals). A coventional millimetre of mercury is widely used in medicine to measure blood pressure via sphygmomanometers and intraocular eye pressure.
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