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.
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.
Kilopascals | Inches of mercury |
---|---|
0
kPa
|
0
inHg
|
10
kPa
|
2.953
inHg
|
20
kPa
|
5.906
inHg
|
30
kPa
|
8.85899
inHg
|
40
kPa
|
11.81199
inHg
|
50
kPa
|
14.76499
inHg
|
60
kPa
|
17.71799
inHg
|
70
kPa
|
20.67099
inHg
|
80
kPa
|
23.62398
inHg
|
90
kPa
|
26.57698
inHg
|
100
kPa
|
29.52998
inHg
|
110
kPa
|
32.48298
inHg
|
120
kPa
|
35.43598
inHg
|
130
kPa
|
38.38897
inHg
|
140
kPa
|
41.34197
inHg
|
150
kPa
|
44.29497
inHg
|
160
kPa
|
47.24797
inHg
|
170
kPa
|
50.20097
inHg
|
180
kPa
|
53.15397
inHg
|
190
kPa
|
56.10696
inHg
|
200
kPa
|
59.05996
inHg
|
210
kPa
|
62.01296
inHg
|
220
kPa
|
64.96596
inHg
|
230
kPa
|
67.91896
inHg
|
240
kPa
|
70.87195
inHg
|
250
kPa
|
73.82495
inHg
|
260
kPa
|
76.77795
inHg
|
270
kPa
|
79.73095
inHg
|
280
kPa
|
82.68395
inHg
|
290
kPa
|
85.63694
inHg
|
300
kPa
|
88.58994
inHg
|
310
kPa
|
91.54294
inHg
|
320
kPa
|
94.49594
inHg
|
330
kPa
|
97.44894
inHg
|
340
kPa
|
100.40193
inHg
|
350
kPa
|
103.35493
inHg
|
360
kPa
|
106.30793
inHg
|
370
kPa
|
109.26093
inHg
|
380
kPa
|
112.21393
inHg
|
390
kPa
|
115.16692
inHg
|
400
kPa
|
118.11992
inHg
|
410
kPa
|
121.07292
inHg
|
420
kPa
|
124.02592
inHg
|
430
kPa
|
126.97892
inHg
|
440
kPa
|
129.93191
inHg
|
450
kPa
|
132.88491
inHg
|
460
kPa
|
135.83791
inHg
|
470
kPa
|
138.79091
inHg
|
480
kPa
|
141.74391
inHg
|
490
kPa
|
144.6969
inHg
|
500
kPa
|
147.6499
inHg
|
510
kPa
|
150.6029
inHg
|
520
kPa
|
153.5559
inHg
|
530
kPa
|
156.5089
inHg
|
540
kPa
|
159.4619
inHg
|
550
kPa
|
162.41489
inHg
|
560
kPa
|
165.36789
inHg
|
570
kPa
|
168.32089
inHg
|
580
kPa
|
171.27389
inHg
|
590
kPa
|
174.22689
inHg
|
600
kPa
|
177.17988
inHg
|
610
kPa
|
180.13288
inHg
|
620
kPa
|
183.08588
inHg
|
630
kPa
|
186.03888
inHg
|
640
kPa
|
188.99188
inHg
|
650
kPa
|
191.94487
inHg
|
660
kPa
|
194.89787
inHg
|
670
kPa
|
197.85087
inHg
|
680
kPa
|
200.80387
inHg
|
690
kPa
|
203.75687
inHg
|
700
kPa
|
206.70986
inHg
|
710
kPa
|
209.66286
inHg
|
720
kPa
|
212.61586
inHg
|
730
kPa
|
215.56886
inHg
|
740
kPa
|
218.52186
inHg
|
750
kPa
|
221.47485
inHg
|
760
kPa
|
224.42785
inHg
|
770
kPa
|
227.38085
inHg
|
780
kPa
|
230.33385
inHg
|
790
kPa
|
233.28685
inHg
|
800
kPa
|
236.23984
inHg
|
810
kPa
|
239.19284
inHg
|
820
kPa
|
242.14584
inHg
|
830
kPa
|
245.09884
inHg
|
840
kPa
|
248.05184
inHg
|
850
kPa
|
251.00483
inHg
|
860
kPa
|
253.95783
inHg
|
870
kPa
|
256.91083
inHg
|
880
kPa
|
259.86383
inHg
|
890
kPa
|
262.81683
inHg
|
900
kPa
|
265.76983
inHg
|
910
kPa
|
268.72282
inHg
|
920
kPa
|
271.67582
inHg
|
930
kPa
|
274.62882
inHg
|
940
kPa
|
277.58182
inHg
|
950
kPa
|
280.53482
inHg
|
960
kPa
|
283.48781
inHg
|
970
kPa
|
286.44081
inHg
|
980
kPa
|
289.39381
inHg
|
990
kPa
|
292.34681
inHg
|
1000
kPa
|
295.29981
inHg
|
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