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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Pounds per square inch (psi) is a crucial unit of pressure measurement, widely used across various industries, including automotive, aviation, and even space exploration. One interesting fact is that a typical car tire is inflated to around 30 psi, but did you know that a commercial jetliner’s cabin is pressurized to a reduced level of 11 psi to simulate being at a comfortable altitude of about 6,000-8,000 feet? This helps passengers avoid the stress of low oxygen levels while flying at over 35,000 feet, where the atmospheric pressure is a meager 4 psi.

Moreover, psi is pivotal in assessing the force exerted on surfaces. If you’ve ever wondered why deep-sea submarines have thick hulls, it’s because they must withstand pressures of around 8,800 psi at depths of 6 miles beneath the ocean’s surface! This ensures safe exploration of the mysterious deep-sea world, showcasing psi’s significance in enabling human feats in extreme environments.

Millimeters of mercury

Pounds per square inch

0 mmHg

0 psi

10 mmHg

0.193367 psi

20 mmHg

0.386734 psi

30 mmHg

0.580101 psi

40 mmHg

0.773469 psi

50 mmHg

0.966836 psi

60 mmHg

1.1602 psi

70 mmHg

1.35357 psi

80 mmHg

1.54694 psi

90 mmHg

1.7403 psi

100 mmHg

1.93367 psi

110 mmHg

2.12704 psi

120 mmHg

2.32041 psi

130 mmHg

2.51377 psi

140 mmHg

2.70714 psi

150 mmHg

2.90051 psi

160 mmHg

3.09387 psi

170 mmHg

3.28724 psi

180 mmHg

3.48061 psi

190 mmHg

3.67398 psi

200 mmHg

3.86734 psi

210 mmHg

4.06071 psi

220 mmHg

4.25408 psi

230 mmHg

4.44744 psi

240 mmHg

4.64081 psi

250 mmHg

4.83418 psi

260 mmHg

5.02755 psi

270 mmHg

5.22091 psi

280 mmHg

5.41428 psi

290 mmHg

5.60765 psi

300 mmHg

5.80101 psi

310 mmHg

5.99438 psi

320 mmHg

6.18775 psi

330 mmHg

6.38112 psi

340 mmHg

6.57448 psi

350 mmHg

6.76785 psi

360 mmHg

6.96122 psi

370 mmHg

7.15458 psi

380 mmHg

7.34795 psi

390 mmHg

7.54132 psi

400 mmHg

7.73469 psi

410 mmHg

7.92805 psi

420 mmHg

8.12142 psi

430 mmHg

8.31479 psi

440 mmHg

8.50815 psi

450 mmHg

8.70152 psi

460 mmHg

8.89489 psi

470 mmHg

9.08826 psi

480 mmHg

9.28162 psi

490 mmHg

9.47499 psi

500 mmHg

9.66836 psi

510 mmHg

9.86172 psi

520 mmHg

10.05509 psi

530 mmHg

10.24846 psi

540 mmHg

10.44183 psi

550 mmHg

10.63519 psi

560 mmHg

10.82856 psi

570 mmHg

11.02193 psi

580 mmHg

11.21529 psi

590 mmHg

11.40866 psi

600 mmHg

11.60203 psi

610 mmHg

11.7954 psi

620 mmHg

11.98876 psi

630 mmHg

12.18213 psi

640 mmHg

12.3755 psi

650 mmHg

12.56886 psi

660 mmHg

12.76223 psi

670 mmHg

12.9556 psi

680 mmHg

13.14897 psi

690 mmHg

13.34233 psi

700 mmHg

13.5357 psi

710 mmHg

13.72907 psi

720 mmHg

13.92243 psi

730 mmHg

14.1158 psi

740 mmHg

14.30917 psi

750 mmHg

14.50254 psi

760 mmHg

14.6959 psi

770 mmHg

14.88927 psi

780 mmHg

15.08264 psi

790 mmHg

15.276 psi

800 mmHg

15.46937 psi

810 mmHg

15.66274 psi

820 mmHg

15.85611 psi

830 mmHg

16.04947 psi

840 mmHg

16.24284 psi

850 mmHg

16.43621 psi

860 mmHg

16.62957 psi

870 mmHg

16.82294 psi

880 mmHg

17.01631 psi

890 mmHg

17.20968 psi

900 mmHg

17.40304 psi

910 mmHg

17.59641 psi

920 mmHg

17.78978 psi

930 mmHg

17.98314 psi

940 mmHg

18.17651 psi

950 mmHg

18.36988 psi

960 mmHg

18.56325 psi

970 mmHg

18.75661 psi

980 mmHg

18.94998 psi

990 mmHg

19.14335 psi

1000 mmHg

19.33671 psi

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 Bar

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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 Kilopound per square inch

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Millimeters of mercury to Inches of mercury

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Millimeters of mercury to Pounds per inch² Conversion

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> Millimeters of mercury to Pounds per inch² Conversion Table

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:: Pressure Units

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