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.
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.
| Kilopound per square inch | Millimeters of mercury |
|---|---|
0
ksi
|
0
mmHg
|
0.1
ksi
|
5171.50958
mmHg
|
0.2
ksi
|
10343.01916
mmHg
|
0.3
ksi
|
15514.52874
mmHg
|
0.4
ksi
|
20686.03831
mmHg
|
0.5
ksi
|
25857.54789
mmHg
|
0.6
ksi
|
31029.05747
mmHg
|
0.7
ksi
|
36200.56705
mmHg
|
0.8
ksi
|
41372.07663
mmHg
|
0.9
ksi
|
46543.58621
mmHg
|
1
ksi
|
51715.09579
mmHg
|
1.1
ksi
|
56886.60537
mmHg
|
1.2
ksi
|
62058.11494
mmHg
|
1.3
ksi
|
67229.62452
mmHg
|
1.4
ksi
|
72401.1341
mmHg
|
1.5
ksi
|
77572.64368
mmHg
|
1.6
ksi
|
82744.15326
mmHg
|
1.7
ksi
|
87915.66284
mmHg
|
1.8
ksi
|
93087.17242
mmHg
|
1.9
ksi
|
98258.68199
mmHg
|
2
ksi
|
103430.19157
mmHg
|
2.1
ksi
|
108601.70115
mmHg
|
2.2
ksi
|
113773.21073
mmHg
|
2.3
ksi
|
118944.72031
mmHg
|
2.4
ksi
|
124116.22989
mmHg
|
2.5
ksi
|
129287.73947
mmHg
|
2.6
ksi
|
134459.24904
mmHg
|
2.7
ksi
|
139630.75862
mmHg
|
2.8
ksi
|
144802.2682
mmHg
|
2.9
ksi
|
149973.77778
mmHg
|
3
ksi
|
155145.28736
mmHg
|
3.1
ksi
|
160316.79694
mmHg
|
3.2
ksi
|
165488.30652
mmHg
|
3.3
ksi
|
170659.8161
mmHg
|
3.4
ksi
|
175831.32567
mmHg
|
3.5
ksi
|
181002.83525
mmHg
|
3.6
ksi
|
186174.34483
mmHg
|
3.7
ksi
|
191345.85441
mmHg
|
3.8
ksi
|
196517.36399
mmHg
|
3.9
ksi
|
201688.87357
mmHg
|
4
ksi
|
206860.38315
mmHg
|
4.1
ksi
|
212031.89272
mmHg
|
4.2
ksi
|
217203.4023
mmHg
|
4.3
ksi
|
222374.91188
mmHg
|
4.4
ksi
|
227546.42146
mmHg
|
4.5
ksi
|
232717.93104
mmHg
|
4.6
ksi
|
237889.44062
mmHg
|
4.7
ksi
|
243060.9502
mmHg
|
4.8
ksi
|
248232.45978
mmHg
|
4.9
ksi
|
253403.96935
mmHg
|
5
ksi
|
258575.47893
mmHg
|
5.1
ksi
|
263746.98851
mmHg
|
5.2
ksi
|
268918.49809
mmHg
|
5.3
ksi
|
274090.00767
mmHg
|
5.4
ksi
|
279261.51725
mmHg
|
5.5
ksi
|
284433.02683
mmHg
|
5.6
ksi
|
289604.5364
mmHg
|
5.7
ksi
|
294776.04598
mmHg
|
5.8
ksi
|
299947.55556
mmHg
|
5.9
ksi
|
305119.06514
mmHg
|
6
ksi
|
310290.57472
mmHg
|
6.1
ksi
|
315462.0843
mmHg
|
6.2
ksi
|
320633.59388
mmHg
|
6.3
ksi
|
325805.10346
mmHg
|
6.4
ksi
|
330976.61303
mmHg
|
6.5
ksi
|
336148.12261
mmHg
|
6.6
ksi
|
341319.63219
mmHg
|
6.7
ksi
|
346491.14177
mmHg
|
6.8
ksi
|
351662.65135
mmHg
|
6.9
ksi
|
356834.16093
mmHg
|
7
ksi
|
362005.67051
mmHg
|
7.1
ksi
|
367177.18008
mmHg
|
7.2
ksi
|
372348.68966
mmHg
|
7.3
ksi
|
377520.19924
mmHg
|
7.4
ksi
|
382691.70882
mmHg
|
7.5
ksi
|
387863.2184
mmHg
|
7.6
ksi
|
393034.72798
mmHg
|
7.7
ksi
|
398206.23756
mmHg
|
7.8
ksi
|
403377.74713
mmHg
|
7.9
ksi
|
408549.25671
mmHg
|
8
ksi
|
413720.76629
mmHg
|
8.1
ksi
|
418892.27587
mmHg
|
8.2
ksi
|
424063.78545
mmHg
|
8.3
ksi
|
429235.29503
mmHg
|
8.4
ksi
|
434406.80461
mmHg
|
8.5
ksi
|
439578.31419
mmHg
|
8.6
ksi
|
444749.82376
mmHg
|
8.7
ksi
|
449921.33334
mmHg
|
8.8
ksi
|
455092.84292
mmHg
|
8.9
ksi
|
460264.3525
mmHg
|
9
ksi
|
465435.86208
mmHg
|
9.1
ksi
|
470607.37166
mmHg
|
9.2
ksi
|
475778.88124
mmHg
|
9.3
ksi
|
480950.39081
mmHg
|
9.4
ksi
|
486121.90039
mmHg
|
9.5
ksi
|
491293.40997
mmHg
|
9.6
ksi
|
496464.91955
mmHg
|
9.7
ksi
|
501636.42913
mmHg
|
9.8
ksi
|
506807.93871
mmHg
|
9.9
ksi
|
511979.44829
mmHg
|
10
ksi
|
517150.95787
mmHg
|
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