, i.e. precisely pascals.

: 1 mmHg = 1=1 mm × {{val × val|9.80665|u=m/s2}}}} = (exactly)

The use of an actual column of mercury for precise measurement of pressure requires corrections for the actual gravity at given location (±0.44%) and the density of mercury at the actual temperature (-0.45% at ). If the top the column - the surface whose height is being measured - is exposed to some other fluid, that other fluid's temperature-dependent

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