• inHg   MPa
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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.

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The megapascal (MPa) is a unit of pressure that is often used in a variety of scientific and engineering calculations, especially in materials science. One fascinating aspect of the megapascal is how it bridges different disciplines, such as geology, where it helps measure the strength of rocks, and civil engineering, where it is crucial for understanding the stress in structures. Interestingly, 1 MPa is equivalent to the pressure exerted by a weight of about 10.2 metric tons on a single square meter, illustrating its significant impact compared to everyday pressures we encounter.

In the realm of meteorology, pressures measured in MPa can indicate catastrophic weather conditions, as atmospheric pressure is usually measured in hectorpascals due to its lower scale. Also noteworthy is the use of MPa in automotive engine performance, where it assesses combustion forces, underlying the importance of this unit in ensuring both vehicle efficiency and safety. Thus, the megapascal is vital across varied fields, reflecting the diverse applications of pressure measurement in modern technology and natural phenomena.

> Inches of mercury to Megapascals Conversion Table

Inches of mercury Megapascals
0 inHg 0 MPa
1 inHg 0.00338639 MPa
2 inHg 0.00677278 MPa
3 inHg 0.0101592 MPa
4 inHg 0.0135456 MPa
5 inHg 0.0169319 MPa
6 inHg 0.0203183 MPa
7 inHg 0.0237047 MPa
8 inHg 0.0270911 MPa
9 inHg 0.0304775 MPa
10 inHg 0.0338639 MPa
11 inHg 0.0372503 MPa
12 inHg 0.0406367 MPa
13 inHg 0.0440231 MPa
14 inHg 0.0474094 MPa
15 inHg 0.0507958 MPa
16 inHg 0.0541822 MPa
17 inHg 0.0575686 MPa
18 inHg 0.060955 MPa
19 inHg 0.0643414 MPa
20 inHg 0.0677278 MPa
21 inHg 0.0711142 MPa
22 inHg 0.0745006 MPa
23 inHg 0.0778869 MPa
24 inHg 0.0812733 MPa
25 inHg 0.0846597 MPa
26 inHg 0.0880461 MPa
27 inHg 0.0914325 MPa
28 inHg 0.0948189 MPa
29 inHg 0.0982053 MPa
30 inHg 0.101592 MPa
31 inHg 0.104978 MPa
32 inHg 0.108364 MPa
33 inHg 0.111751 MPa
34 inHg 0.115137 MPa
35 inHg 0.118524 MPa
36 inHg 0.12191 MPa
37 inHg 0.125296 MPa
38 inHg 0.128683 MPa
39 inHg 0.132069 MPa
40 inHg 0.135456 MPa
41 inHg 0.138842 MPa
42 inHg 0.142228 MPa
43 inHg 0.145615 MPa
44 inHg 0.149001 MPa
45 inHg 0.152388 MPa
46 inHg 0.155774 MPa
47 inHg 0.15916 MPa
48 inHg 0.162547 MPa
49 inHg 0.165933 MPa
50 inHg 0.169319 MPa
51 inHg 0.172706 MPa
52 inHg 0.176092 MPa
53 inHg 0.179479 MPa
54 inHg 0.182865 MPa
55 inHg 0.186251 MPa
56 inHg 0.189638 MPa
57 inHg 0.193024 MPa
58 inHg 0.196411 MPa
59 inHg 0.199797 MPa
60 inHg 0.203183 MPa
61 inHg 0.20657 MPa
62 inHg 0.209956 MPa
63 inHg 0.213343 MPa
64 inHg 0.216729 MPa
65 inHg 0.220115 MPa
66 inHg 0.223502 MPa
67 inHg 0.226888 MPa
68 inHg 0.230274 MPa
69 inHg 0.233661 MPa
70 inHg 0.237047 MPa
71 inHg 0.240434 MPa
72 inHg 0.24382 MPa
73 inHg 0.247206 MPa
74 inHg 0.250593 MPa
75 inHg 0.253979 MPa
76 inHg 0.257366 MPa
77 inHg 0.260752 MPa
78 inHg 0.264138 MPa
79 inHg 0.267525 MPa
80 inHg 0.270911 MPa
81 inHg 0.274298 MPa
82 inHg 0.277684 MPa
83 inHg 0.28107 MPa
84 inHg 0.284457 MPa
85 inHg 0.287843 MPa
86 inHg 0.291229 MPa
87 inHg 0.294616 MPa
88 inHg 0.298002 MPa
89 inHg 0.301389 MPa
90 inHg 0.304775 MPa
91 inHg 0.308161 MPa
92 inHg 0.311548 MPa
93 inHg 0.314934 MPa
94 inHg 0.318321 MPa
95 inHg 0.321707 MPa
96 inHg 0.325093 MPa
97 inHg 0.32848 MPa
98 inHg 0.331866 MPa
99 inHg 0.335253 MPa
100 inHg 0.338639 MPa