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.
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.
Megapascals | Inches of mercury |
---|---|
0
MPa
|
0
inHg
|
1
MPa
|
295.29981
inHg
|
2
MPa
|
590.59961
inHg
|
3
MPa
|
885.89942
inHg
|
4
MPa
|
1181.19922
inHg
|
5
MPa
|
1476.49903
inHg
|
6
MPa
|
1771.79883
inHg
|
7
MPa
|
2067.09864
inHg
|
8
MPa
|
2362.39845
inHg
|
9
MPa
|
2657.69825
inHg
|
10
MPa
|
2952.99806
inHg
|
11
MPa
|
3248.29786
inHg
|
12
MPa
|
3543.59767
inHg
|
13
MPa
|
3838.89747
inHg
|
14
MPa
|
4134.19728
inHg
|
15
MPa
|
4429.49709
inHg
|
16
MPa
|
4724.79689
inHg
|
17
MPa
|
5020.0967
inHg
|
18
MPa
|
5315.3965
inHg
|
19
MPa
|
5610.69631
inHg
|
20
MPa
|
5905.99611
inHg
|
21
MPa
|
6201.29592
inHg
|
22
MPa
|
6496.59573
inHg
|
23
MPa
|
6791.89553
inHg
|
24
MPa
|
7087.19534
inHg
|
25
MPa
|
7382.49514
inHg
|
26
MPa
|
7677.79495
inHg
|
27
MPa
|
7973.09475
inHg
|
28
MPa
|
8268.39456
inHg
|
29
MPa
|
8563.69437
inHg
|
30
MPa
|
8858.99417
inHg
|
31
MPa
|
9154.29398
inHg
|
32
MPa
|
9449.59378
inHg
|
33
MPa
|
9744.89359
inHg
|
34
MPa
|
10040.19339
inHg
|
35
MPa
|
10335.4932
inHg
|
36
MPa
|
10630.79301
inHg
|
37
MPa
|
10926.09281
inHg
|
38
MPa
|
11221.39262
inHg
|
39
MPa
|
11516.69242
inHg
|
40
MPa
|
11811.99223
inHg
|
41
MPa
|
12107.29203
inHg
|
42
MPa
|
12402.59184
inHg
|
43
MPa
|
12697.89165
inHg
|
44
MPa
|
12993.19145
inHg
|
45
MPa
|
13288.49126
inHg
|
46
MPa
|
13583.79106
inHg
|
47
MPa
|
13879.09087
inHg
|
48
MPa
|
14174.39067
inHg
|
49
MPa
|
14469.69048
inHg
|
50
MPa
|
14764.99029
inHg
|
51
MPa
|
15060.29009
inHg
|
52
MPa
|
15355.5899
inHg
|
53
MPa
|
15650.8897
inHg
|
54
MPa
|
15946.18951
inHg
|
55
MPa
|
16241.48931
inHg
|
56
MPa
|
16536.78912
inHg
|
57
MPa
|
16832.08893
inHg
|
58
MPa
|
17127.38873
inHg
|
59
MPa
|
17422.68854
inHg
|
60
MPa
|
17717.98834
inHg
|
61
MPa
|
18013.28815
inHg
|
62
MPa
|
18308.58795
inHg
|
63
MPa
|
18603.88776
inHg
|
64
MPa
|
18899.18757
inHg
|
65
MPa
|
19194.48737
inHg
|
66
MPa
|
19489.78718
inHg
|
67
MPa
|
19785.08698
inHg
|
68
MPa
|
20080.38679
inHg
|
69
MPa
|
20375.68659
inHg
|
70
MPa
|
20670.9864
inHg
|
71
MPa
|
20966.28621
inHg
|
72
MPa
|
21261.58601
inHg
|
73
MPa
|
21556.88582
inHg
|
74
MPa
|
21852.18562
inHg
|
75
MPa
|
22147.48543
inHg
|
76
MPa
|
22442.78523
inHg
|
77
MPa
|
22738.08504
inHg
|
78
MPa
|
23033.38485
inHg
|
79
MPa
|
23328.68465
inHg
|
80
MPa
|
23623.98446
inHg
|
81
MPa
|
23919.28426
inHg
|
82
MPa
|
24214.58407
inHg
|
83
MPa
|
24509.88387
inHg
|
84
MPa
|
24805.18368
inHg
|
85
MPa
|
25100.48349
inHg
|
86
MPa
|
25395.78329
inHg
|
87
MPa
|
25691.0831
inHg
|
88
MPa
|
25986.3829
inHg
|
89
MPa
|
26281.68271
inHg
|
90
MPa
|
26576.98252
inHg
|
91
MPa
|
26872.28232
inHg
|
92
MPa
|
27167.58213
inHg
|
93
MPa
|
27462.88193
inHg
|
94
MPa
|
27758.18174
inHg
|
95
MPa
|
28053.48154
inHg
|
96
MPa
|
28348.78135
inHg
|
97
MPa
|
28644.08116
inHg
|
98
MPa
|
28939.38096
inHg
|
99
MPa
|
29234.68077
inHg
|
100
MPa
|
29529.98057
inHg
|
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