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 kilopound per square inch (ksi) is a unit of pressure that is not as commonly encountered as its smaller counterpart, pounds per square inch (psi). However, it plays a crucial role in engineering and materials science, particularly in the United States, where it is often used to express the tensile strength and yield strength of materials like steel. One ksi is equal to 1,000 psi, making it a convenient way to express large values of pressure or stress without cumbersome zeros.

Interestingly, ksi is commonly used in the context of measuring the mechanical properties of metals, especially in aerospace and automotive industries. These are fields where precise and robust materials are essential for safety and performance. For instance, typical structural steel can have a yield strength on the order of 50 ksi, underscoring the immense stress materials can withstand in such applications. Understanding these units helps engineers ensure that the materials used can handle the demanding conditions they face.

Millimeters of mercury

Kilopound per square inch

0 mmHg

0 ksi

10 mmHg

0.000193367 ksi

20 mmHg

0.000386734 ksi

30 mmHg

0.000580101 ksi

40 mmHg

0.000773469 ksi

50 mmHg

0.000966836 ksi

60 mmHg

0.0011602 ksi

70 mmHg

0.00135357 ksi

80 mmHg

0.00154694 ksi

90 mmHg

0.0017403 ksi

100 mmHg

0.00193367 ksi

110 mmHg

0.00212704 ksi

120 mmHg

0.00232041 ksi

130 mmHg

0.00251377 ksi

140 mmHg

0.00270714 ksi

150 mmHg

0.00290051 ksi

160 mmHg

0.00309387 ksi

170 mmHg

0.00328724 ksi

180 mmHg

0.00348061 ksi

190 mmHg

0.00367398 ksi

200 mmHg

0.00386734 ksi

210 mmHg

0.00406071 ksi

220 mmHg

0.00425408 ksi

230 mmHg

0.00444744 ksi

240 mmHg

0.00464081 ksi

250 mmHg

0.00483418 ksi

260 mmHg

0.00502755 ksi

270 mmHg

0.00522091 ksi

280 mmHg

0.00541428 ksi

290 mmHg

0.00560765 ksi

300 mmHg

0.00580101 ksi

310 mmHg

0.00599438 ksi

320 mmHg

0.00618775 ksi

330 mmHg

0.00638112 ksi

340 mmHg

0.00657448 ksi

350 mmHg

0.00676785 ksi

360 mmHg

0.00696122 ksi

370 mmHg

0.00715458 ksi

380 mmHg

0.00734795 ksi

390 mmHg

0.00754132 ksi

400 mmHg

0.00773469 ksi

410 mmHg

0.00792805 ksi

420 mmHg

0.00812142 ksi

430 mmHg

0.00831479 ksi

440 mmHg

0.00850815 ksi

450 mmHg

0.00870152 ksi

460 mmHg

0.00889489 ksi

470 mmHg

0.00908826 ksi

480 mmHg

0.00928162 ksi

490 mmHg

0.00947499 ksi

500 mmHg

0.00966836 ksi

510 mmHg

0.00986172 ksi

520 mmHg

0.0100551 ksi

530 mmHg

0.0102485 ksi

540 mmHg

0.0104418 ksi

550 mmHg

0.0106352 ksi

560 mmHg

0.0108286 ksi

570 mmHg

0.0110219 ksi

580 mmHg

0.0112153 ksi

590 mmHg

0.0114087 ksi

600 mmHg

0.011602 ksi

610 mmHg

0.0117954 ksi

620 mmHg

0.0119888 ksi

630 mmHg

0.0121821 ksi

640 mmHg

0.0123755 ksi

650 mmHg

0.0125689 ksi

660 mmHg

0.0127622 ksi

670 mmHg

0.0129556 ksi

680 mmHg

0.013149 ksi

690 mmHg

0.0133423 ksi

700 mmHg

0.0135357 ksi

710 mmHg

0.0137291 ksi

720 mmHg

0.0139224 ksi

730 mmHg

0.0141158 ksi

740 mmHg

0.0143092 ksi

750 mmHg

0.0145025 ksi

760 mmHg

0.0146959 ksi

770 mmHg

0.0148893 ksi

780 mmHg

0.0150826 ksi

790 mmHg

0.015276 ksi

800 mmHg

0.0154694 ksi

810 mmHg

0.0156627 ksi

820 mmHg

0.0158561 ksi

830 mmHg

0.0160495 ksi

840 mmHg

0.0162428 ksi

850 mmHg

0.0164362 ksi

860 mmHg

0.0166296 ksi

870 mmHg

0.0168229 ksi

880 mmHg

0.0170163 ksi

890 mmHg

0.0172097 ksi

900 mmHg

0.017403 ksi

910 mmHg

0.0175964 ksi

920 mmHg

0.0177898 ksi

930 mmHg

0.0179831 ksi

940 mmHg

0.0181765 ksi

950 mmHg

0.0183699 ksi

960 mmHg

0.0185632 ksi

970 mmHg

0.0187566 ksi

980 mmHg

0.01895 ksi

990 mmHg

0.0191433 ksi

1000 mmHg

0.0193367 ksi

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 Pounds per square inch

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Millimeters of mercury to Inches of mercury

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Millimeters of mercury to Kilopound per inch² Conversion

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> Millimeters of mercury to Kilopound per inch² Conversion Table

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:: Pressure Units

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:: Pressure Units

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