• inHg   kPa
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Rounding Mode:

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.

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The kilopascal (kPa) is a metric unit of pressure that often finds its application in various everyday and scientific contexts, such as meteorology, engineering, and automotive industries. One intriguing aspect of the kilopascal is its relationship to atmospheric pressure. At sea level, the standard atmospheric pressure is 101.3 kPa. This means when the weather forecast mentions a high or low-pressure system, it’s essentially describing variations in kilopascals, subtly influencing everything from weather patterns to flight dynamics.

In the world of construction and engineering, knowing a material’s tolerance in kilopascals is crucial for ensuring structural integrity and safety. For instance, the force exerted by an average car tire on the ground is about 220 kPa, showcasing kilopascals as a pivotal unit in designing components that need to withstand specific pressures. Such applications highlight its crucial role in both routine and critical decision-making processes.

> Inches of mercury to Kilopascals Conversion Table

Inches of mercury Kilopascals
0 inHg 0 kPa
1 inHg 3.38639 kPa
2 inHg 6.77278 kPa
3 inHg 10.15917 kPa
4 inHg 13.54556 kPa
5 inHg 16.93194 kPa
6 inHg 20.31833 kPa
7 inHg 23.70472 kPa
8 inHg 27.09111 kPa
9 inHg 30.4775 kPa
10 inHg 33.86389 kPa
11 inHg 37.25028 kPa
12 inHg 40.63667 kPa
13 inHg 44.02306 kPa
14 inHg 47.40945 kPa
15 inHg 50.79583 kPa
16 inHg 54.18222 kPa
17 inHg 57.56861 kPa
18 inHg 60.955 kPa
19 inHg 64.34139 kPa
20 inHg 67.72778 kPa
21 inHg 71.11417 kPa
22 inHg 74.50056 kPa
23 inHg 77.88695 kPa
24 inHg 81.27333 kPa
25 inHg 84.65972 kPa
26 inHg 88.04611 kPa
27 inHg 91.4325 kPa
28 inHg 94.81889 kPa
29 inHg 98.20528 kPa
30 inHg 101.59167 kPa
31 inHg 104.97806 kPa
32 inHg 108.36445 kPa
33 inHg 111.75084 kPa
34 inHg 115.13722 kPa
35 inHg 118.52361 kPa
36 inHg 121.91 kPa
37 inHg 125.29639 kPa
38 inHg 128.68278 kPa
39 inHg 132.06917 kPa
40 inHg 135.45556 kPa
41 inHg 138.84195 kPa
42 inHg 142.22834 kPa
43 inHg 145.61472 kPa
44 inHg 149.00111 kPa
45 inHg 152.3875 kPa
46 inHg 155.77389 kPa
47 inHg 159.16028 kPa
48 inHg 162.54667 kPa
49 inHg 165.93306 kPa
50 inHg 169.31945 kPa
51 inHg 172.70584 kPa
52 inHg 176.09223 kPa
53 inHg 179.47861 kPa
54 inHg 182.865 kPa
55 inHg 186.25139 kPa
56 inHg 189.63778 kPa
57 inHg 193.02417 kPa
58 inHg 196.41056 kPa
59 inHg 199.79695 kPa
60 inHg 203.18334 kPa
61 inHg 206.56973 kPa
62 inHg 209.95612 kPa
63 inHg 213.3425 kPa
64 inHg 216.72889 kPa
65 inHg 220.11528 kPa
66 inHg 223.50167 kPa
67 inHg 226.88806 kPa
68 inHg 230.27445 kPa
69 inHg 233.66084 kPa
70 inHg 237.04723 kPa
71 inHg 240.43362 kPa
72 inHg 243.82 kPa
73 inHg 247.20639 kPa
74 inHg 250.59278 kPa
75 inHg 253.97917 kPa
76 inHg 257.36556 kPa
77 inHg 260.75195 kPa
78 inHg 264.13834 kPa
79 inHg 267.52473 kPa
80 inHg 270.91112 kPa
81 inHg 274.29751 kPa
82 inHg 277.68389 kPa
83 inHg 281.07028 kPa
84 inHg 284.45667 kPa
85 inHg 287.84306 kPa
86 inHg 291.22945 kPa
87 inHg 294.61584 kPa
88 inHg 298.00223 kPa
89 inHg 301.38862 kPa
90 inHg 304.77501 kPa
91 inHg 308.16139 kPa
92 inHg 311.54778 kPa
93 inHg 314.93417 kPa
94 inHg 318.32056 kPa
95 inHg 321.70695 kPa
96 inHg 325.09334 kPa
97 inHg 328.47973 kPa
98 inHg 331.86612 kPa
99 inHg 335.25251 kPa
100 inHg 338.6389 kPa