Definition:Millimetre of Mercury

Definition

The millimetre of mercury is an metric unit of pressure.

It is defined as being:

The amount of pressure generated by a column of mercury of density $13 \, 595 \cdotp 1 \, \mathrm {kg \, m}^{-3}$ one millimetre high under standard gravity.

Conversion Factors

\(\ds \)

\(\)

\(\ds 1\)

millimetre of mercury

\(\ds \)

\(\approx\)

\(\ds 1 \cdotp 00000 \, 01424 \, 66321\)

torr

\(\ds \)

\(\approx\)

\(\ds 133 \cdotp 322\)

pascals

Symbol

$\mathrm {mm \, Hg}$

The symbol for the millimetre of mercury is $\mathrm {mm \, Hg}$.

The $\LaTeX$ code for \(\mathrm {mm \, Hg}\) is \mathrm {mm \, Hg} .

Linguistic Note on Milli-

The prefix milli- derives from the Latin mille, which means one thousand.

Sources

• 1969: J.C. Anderson, D.M. Hum, B.G. Neal and J.H. Whitelaw: Data and Formulae for Engineering Students (2nd ed.) ... (previous) ... (next): $2.$ Unit Conversion Factors
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): millimetre of mercury
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): millimetre of mercury