• inHg   ksi
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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.

Did you know?

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.

> Inches of mercury to Kilopound per inch² Conversion Table

Inches of mercury Kilopound per square inch
0 inHg 0 ksi
1 inHg 0.000491154 ksi
2 inHg 0.000982308 ksi
3 inHg 0.00147346 ksi
4 inHg 0.00196462 ksi
5 inHg 0.00245577 ksi
6 inHg 0.00294692 ksi
7 inHg 0.00343808 ksi
8 inHg 0.00392923 ksi
9 inHg 0.00442039 ksi
10 inHg 0.00491154 ksi
11 inHg 0.00540269 ksi
12 inHg 0.00589385 ksi
13 inHg 0.006385 ksi
14 inHg 0.00687616 ksi
15 inHg 0.00736731 ksi
16 inHg 0.00785846 ksi
17 inHg 0.00834962 ksi
18 inHg 0.00884077 ksi
19 inHg 0.00933193 ksi
20 inHg 0.00982308 ksi
21 inHg 0.0103142 ksi
22 inHg 0.0108054 ksi
23 inHg 0.0112965 ksi
24 inHg 0.0117877 ksi
25 inHg 0.0122789 ksi
26 inHg 0.01277 ksi
27 inHg 0.0132612 ksi
28 inHg 0.0137523 ksi
29 inHg 0.0142435 ksi
30 inHg 0.0147346 ksi
31 inHg 0.0152258 ksi
32 inHg 0.0157169 ksi
33 inHg 0.0162081 ksi
34 inHg 0.0166992 ksi
35 inHg 0.0171904 ksi
36 inHg 0.0176815 ksi
37 inHg 0.0181727 ksi
38 inHg 0.0186639 ksi
39 inHg 0.019155 ksi
40 inHg 0.0196462 ksi
41 inHg 0.0201373 ksi
42 inHg 0.0206285 ksi
43 inHg 0.0211196 ksi
44 inHg 0.0216108 ksi
45 inHg 0.0221019 ksi
46 inHg 0.0225931 ksi
47 inHg 0.0230842 ksi
48 inHg 0.0235754 ksi
49 inHg 0.0240665 ksi
50 inHg 0.0245577 ksi
51 inHg 0.0250489 ksi
52 inHg 0.02554 ksi
53 inHg 0.0260312 ksi
54 inHg 0.0265223 ksi
55 inHg 0.0270135 ksi
56 inHg 0.0275046 ksi
57 inHg 0.0279958 ksi
58 inHg 0.0284869 ksi
59 inHg 0.0289781 ksi
60 inHg 0.0294692 ksi
61 inHg 0.0299604 ksi
62 inHg 0.0304515 ksi
63 inHg 0.0309427 ksi
64 inHg 0.0314339 ksi
65 inHg 0.031925 ksi
66 inHg 0.0324162 ksi
67 inHg 0.0329073 ksi
68 inHg 0.0333985 ksi
69 inHg 0.0338896 ksi
70 inHg 0.0343808 ksi
71 inHg 0.0348719 ksi
72 inHg 0.0353631 ksi
73 inHg 0.0358542 ksi
74 inHg 0.0363454 ksi
75 inHg 0.0368366 ksi
76 inHg 0.0373277 ksi
77 inHg 0.0378189 ksi
78 inHg 0.03831 ksi
79 inHg 0.0388012 ksi
80 inHg 0.0392923 ksi
81 inHg 0.0397835 ksi
82 inHg 0.0402746 ksi
83 inHg 0.0407658 ksi
84 inHg 0.0412569 ksi
85 inHg 0.0417481 ksi
86 inHg 0.0422392 ksi
87 inHg 0.0427304 ksi
88 inHg 0.0432216 ksi
89 inHg 0.0437127 ksi
90 inHg 0.0442039 ksi
91 inHg 0.044695 ksi
92 inHg 0.0451862 ksi
93 inHg 0.0456773 ksi
94 inHg 0.0461685 ksi
95 inHg 0.0466596 ksi
96 inHg 0.0471508 ksi
97 inHg 0.0476419 ksi
98 inHg 0.0481331 ksi
99 inHg 0.0486242 ksi
100 inHg 0.0491154 ksi