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 “inch of mercury” (inHg) is a unit of pressure commonly used in aviation, meteorology, and refrigeration. It originates from the barometric pressure measurement practice using a column of mercury. This unit became a staple due to its early adoption in weather forecasting and its accurate and consistent measurements. An interesting fact is that an inch of mercury is approximately equal to 33.86 millibars or 3386 Pascals, but what truly distinguishes it is its historical significance in the development of modern atmospheric science.
In the 17th century, Evangelista Torricelli, a student of Galileo, first discovered that atmospheric pressure could sustain a column of mercury, laying the groundwork for this unit. His invention, the barometer, revolutionized how we understand and predict weather, marking the inch of mercury as more than just a unit—it’s a nod to the evolution of scientific inquiry and practice.
Kilopound per square inch | Inches of mercury |
---|---|
0
ksi
|
0
inHg
|
0.1
ksi
|
203.60213
inHg
|
0.2
ksi
|
407.20426
inHg
|
0.3
ksi
|
610.80639
inHg
|
0.4
ksi
|
814.40852
inHg
|
0.5
ksi
|
1018.01064
inHg
|
0.6
ksi
|
1221.61277
inHg
|
0.7
ksi
|
1425.2149
inHg
|
0.8
ksi
|
1628.81703
inHg
|
0.9
ksi
|
1832.41916
inHg
|
1
ksi
|
2036.02129
inHg
|
1.1
ksi
|
2239.62342
inHg
|
1.2
ksi
|
2443.22555
inHg
|
1.3
ksi
|
2646.82768
inHg
|
1.4
ksi
|
2850.4298
inHg
|
1.5
ksi
|
3054.03193
inHg
|
1.6
ksi
|
3257.63406
inHg
|
1.7
ksi
|
3461.23619
inHg
|
1.8
ksi
|
3664.83832
inHg
|
1.9
ksi
|
3868.44045
inHg
|
2
ksi
|
4072.04258
inHg
|
2.1
ksi
|
4275.64471
inHg
|
2.2
ksi
|
4479.24684
inHg
|
2.3
ksi
|
4682.84896
inHg
|
2.4
ksi
|
4886.45109
inHg
|
2.5
ksi
|
5090.05322
inHg
|
2.6
ksi
|
5293.65535
inHg
|
2.7
ksi
|
5497.25748
inHg
|
2.8
ksi
|
5700.85961
inHg
|
2.9
ksi
|
5904.46174
inHg
|
3
ksi
|
6108.06387
inHg
|
3.1
ksi
|
6311.66599
inHg
|
3.2
ksi
|
6515.26812
inHg
|
3.3
ksi
|
6718.87025
inHg
|
3.4
ksi
|
6922.47238
inHg
|
3.5
ksi
|
7126.07451
inHg
|
3.6
ksi
|
7329.67664
inHg
|
3.7
ksi
|
7533.27877
inHg
|
3.8
ksi
|
7736.8809
inHg
|
3.9
ksi
|
7940.48303
inHg
|
4
ksi
|
8144.08515
inHg
|
4.1
ksi
|
8347.68728
inHg
|
4.2
ksi
|
8551.28941
inHg
|
4.3
ksi
|
8754.89154
inHg
|
4.4
ksi
|
8958.49367
inHg
|
4.5
ksi
|
9162.0958
inHg
|
4.6
ksi
|
9365.69793
inHg
|
4.7
ksi
|
9569.30006
inHg
|
4.8
ksi
|
9772.90219
inHg
|
4.9
ksi
|
9976.50431
inHg
|
5
ksi
|
10180.10644
inHg
|
5.1
ksi
|
10383.70857
inHg
|
5.2
ksi
|
10587.3107
inHg
|
5.3
ksi
|
10790.91283
inHg
|
5.4
ksi
|
10994.51496
inHg
|
5.5
ksi
|
11198.11709
inHg
|
5.6
ksi
|
11401.71922
inHg
|
5.7
ksi
|
11605.32135
inHg
|
5.8
ksi
|
11808.92347
inHg
|
5.9
ksi
|
12012.5256
inHg
|
6
ksi
|
12216.12773
inHg
|
6.1
ksi
|
12419.72986
inHg
|
6.2
ksi
|
12623.33199
inHg
|
6.3
ksi
|
12826.93412
inHg
|
6.4
ksi
|
13030.53625
inHg
|
6.5
ksi
|
13234.13838
inHg
|
6.6
ksi
|
13437.74051
inHg
|
6.7
ksi
|
13641.34263
inHg
|
6.8
ksi
|
13844.94476
inHg
|
6.9
ksi
|
14048.54689
inHg
|
7
ksi
|
14252.14902
inHg
|
7.1
ksi
|
14455.75115
inHg
|
7.2
ksi
|
14659.35328
inHg
|
7.3
ksi
|
14862.95541
inHg
|
7.4
ksi
|
15066.55754
inHg
|
7.5
ksi
|
15270.15966
inHg
|
7.6
ksi
|
15473.76179
inHg
|
7.7
ksi
|
15677.36392
inHg
|
7.8
ksi
|
15880.96605
inHg
|
7.9
ksi
|
16084.56818
inHg
|
8
ksi
|
16288.17031
inHg
|
8.1
ksi
|
16491.77244
inHg
|
8.2
ksi
|
16695.37457
inHg
|
8.3
ksi
|
16898.9767
inHg
|
8.4
ksi
|
17102.57882
inHg
|
8.5
ksi
|
17306.18095
inHg
|
8.6
ksi
|
17509.78308
inHg
|
8.7
ksi
|
17713.38521
inHg
|
8.8
ksi
|
17916.98734
inHg
|
8.9
ksi
|
18120.58947
inHg
|
9
ksi
|
18324.1916
inHg
|
9.1
ksi
|
18527.79373
inHg
|
9.2
ksi
|
18731.39586
inHg
|
9.3
ksi
|
18934.99798
inHg
|
9.4
ksi
|
19138.60011
inHg
|
9.5
ksi
|
19342.20224
inHg
|
9.6
ksi
|
19545.80437
inHg
|
9.7
ksi
|
19749.4065
inHg
|
9.8
ksi
|
19953.00863
inHg
|
9.9
ksi
|
20156.61076
inHg
|
10
ksi
|
20360.21289
inHg
|
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