The millimeter of mercury (mmHg) is a unit of pressure traditionally used in medicine and meteorology, and its history dates back to the barometer invention by Evangelista Torricelli in 1643. Often, it is associated with measuring blood pressure and intraocular pressure, representing the pressure exerted by a column of mercury precisely 1 millimeter high. This fascinating unit highlights the interplay of physics and medicine, reflecting both the force of blood circulating against vessel walls and the atmospheric pressure’s effects on our weather systems.

Interestingly, mmHg is one of the few units still officially sanctioned for use with SI (International System of Units) under specific legal and medical contexts, underscoring its importance over centuries. Despite the global shift towards using Pascals for pressure, mmHg remains ingrained in clinical settings because of its historical usage and direct relation to human physiology. Its origins and continued use illustrate how historical scientific instruments still influence modern practices.

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The “bar” is a metric unit of pressure, commonly used in meteorology to describe atmospheric pressure — one bar is approximately equal to the atmospheric pressure on Earth at sea level. Interestingly, the term “bar” originates from the Greek word “baros,” meaning weight. This unit is not only practical for forecasting weather but also critical in various scientific fields, such as oceanography and engineering, where accurate pressure measurements are crucial.

A fascinating aspect of the bar is its application in scuba diving. Divers often use bar to read their submersible pressure gauges to monitor air consumption. Moreover, understanding bar pressure changes is essential in deep-sea diving to avoid decompression sickness, a condition caused by rapid changes in pressure. Thus, the bar is a pivotal unit in both scientific and everyday contexts.

Millimeters of mercury

Bar

0 mmHg

0 bar

10 mmHg

0.0133322 bar

20 mmHg

0.0266644 bar

30 mmHg

0.0399966 bar

40 mmHg

0.0533288 bar

50 mmHg

0.066661 bar

60 mmHg

0.0799932 bar

70 mmHg

0.0933254 bar

80 mmHg

0.106658 bar

90 mmHg

0.11999 bar

100 mmHg

0.133322 bar

110 mmHg

0.146654 bar

120 mmHg

0.159986 bar

130 mmHg

0.173319 bar

140 mmHg

0.186651 bar

150 mmHg

0.199983 bar

160 mmHg

0.213315 bar

170 mmHg

0.226647 bar

180 mmHg

0.23998 bar

190 mmHg

0.253312 bar

200 mmHg

0.266644 bar

210 mmHg

0.279976 bar

220 mmHg

0.293308 bar

230 mmHg

0.306641 bar

240 mmHg

0.319973 bar

250 mmHg

0.333305 bar

260 mmHg

0.346637 bar

270 mmHg

0.359969 bar

280 mmHg

0.373302 bar

290 mmHg

0.386634 bar

300 mmHg

0.399966 bar

310 mmHg

0.413298 bar

320 mmHg

0.42663 bar

330 mmHg

0.439963 bar

340 mmHg

0.453295 bar

350 mmHg

0.466627 bar

360 mmHg

0.479959 bar

370 mmHg

0.493291 bar

380 mmHg

0.506624 bar

390 mmHg

0.519956 bar

400 mmHg

0.533288 bar

410 mmHg

0.54662 bar

420 mmHg

0.559952 bar

430 mmHg

0.573285 bar

440 mmHg

0.586617 bar

450 mmHg

0.599949 bar

460 mmHg

0.613281 bar

470 mmHg

0.626613 bar

480 mmHg

0.639946 bar

490 mmHg

0.653278 bar

500 mmHg

0.66661 bar

510 mmHg

0.679942 bar

520 mmHg

0.693274 bar

530 mmHg

0.706607 bar

540 mmHg

0.719939 bar

550 mmHg

0.733271 bar

560 mmHg

0.746603 bar

570 mmHg

0.759935 bar

580 mmHg

0.773268 bar

590 mmHg

0.7866 bar

600 mmHg

0.799932 bar

610 mmHg

0.813264 bar

620 mmHg

0.826596 bar

630 mmHg

0.839929 bar

640 mmHg

0.853261 bar

650 mmHg

0.866593 bar

660 mmHg

0.879925 bar

670 mmHg

0.893257 bar

680 mmHg

0.90659 bar

690 mmHg

0.919922 bar

700 mmHg

0.933254 bar

710 mmHg

0.946586 bar

720 mmHg

0.959918 bar

730 mmHg

0.973251 bar

740 mmHg

0.986583 bar

750 mmHg

0.999915 bar

760 mmHg

1.01325 bar

770 mmHg

1.02658 bar

780 mmHg

1.03991 bar

790 mmHg

1.05324 bar

800 mmHg

1.06658 bar

810 mmHg

1.07991 bar

820 mmHg

1.09324 bar

830 mmHg

1.10657 bar

840 mmHg

1.1199 bar

850 mmHg

1.13324 bar

860 mmHg

1.14657 bar

870 mmHg

1.1599 bar

880 mmHg

1.17323 bar

890 mmHg

1.18657 bar

900 mmHg

1.1999 bar

910 mmHg

1.21323 bar

920 mmHg

1.22656 bar

930 mmHg

1.23989 bar

940 mmHg

1.25323 bar

950 mmHg

1.26656 bar

960 mmHg

1.27989 bar

970 mmHg

1.29322 bar

980 mmHg

1.30656 bar

990 mmHg

1.31989 bar

1000 mmHg

1.33322 bar

Conversion

Millimeters of mercury to Pascals

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Millimeters of mercury to Kilopascals

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Millimeters of mercury to Megapascals

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Millimeters of mercury to Hectopascals

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Millimeters of mercury to Millibar

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Millimeters of mercury to Torr

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Millimeters of mercury to Meters of water @ 4°C

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Millimeters of mercury to Pounds per square inch

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Millimeters of mercury to Kilopound per square inch

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Millimeters of mercury to Inches of mercury

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Millimeters of mercury to Bar Conversion

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> Millimeters of mercury to Bar Conversion Table

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:: Pressure Units

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:: Pressure Units

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