The hectopascal (hPa) is a commonly used unit for measuring atmospheric pressure, especially in meteorology. One hPa is equivalent to 100 pascals, making it a preferred measurement over pascals due to the convenient scale. Interestingly, 1 hPa is also equivalent to 1 millibar, a unit that was widely used before the adoption of the hectopascal. This equivalence makes it easy for transitioning instruments and readings in weather maps and reports.
Hectopascals play a crucial role in understanding atmospheric conditions, such as weather forecasting and studying phenomena like hurricanes or cyclones. Typically, sea-level pressure is around 1013 hPa, and deviations from this can indicate changing weather patterns, with lower pressures often associated with storm systems. This connection makes the hPa unit vital for predicting and understanding weather events globally.
Pounds per square inch (psi) is a crucial unit of pressure measurement, widely used across various industries, including automotive, aviation, and even space exploration. One interesting fact is that a typical car tire is inflated to around 30 psi, but did you know that a commercial jetliner’s cabin is pressurized to a reduced level of 11 psi to simulate being at a comfortable altitude of about 6,000-8,000 feet? This helps passengers avoid the stress of low oxygen levels while flying at over 35,000 feet, where the atmospheric pressure is a meager 4 psi.
Moreover, psi is pivotal in assessing the force exerted on surfaces. If you’ve ever wondered why deep-sea submarines have thick hulls, it’s because they must withstand pressures of around 8,800 psi at depths of 6 miles beneath the ocean’s surface! This ensures safe exploration of the mysterious deep-sea world, showcasing psi’s significance in enabling human feats in extreme environments.
Hectopascals | Pounds per square inch |
---|---|
0
hPa
|
0
psi
|
10
hPa
|
0.145038
psi
|
20
hPa
|
0.290075
psi
|
30
hPa
|
0.435113
psi
|
40
hPa
|
0.580151
psi
|
50
hPa
|
0.725188
psi
|
60
hPa
|
0.870226
psi
|
70
hPa
|
1.01526
psi
|
80
hPa
|
1.1603
psi
|
90
hPa
|
1.30534
psi
|
100
hPa
|
1.45038
psi
|
110
hPa
|
1.59541
psi
|
120
hPa
|
1.74045
psi
|
130
hPa
|
1.88549
psi
|
140
hPa
|
2.03053
psi
|
150
hPa
|
2.17557
psi
|
160
hPa
|
2.3206
psi
|
170
hPa
|
2.46564
psi
|
180
hPa
|
2.61068
psi
|
190
hPa
|
2.75572
psi
|
200
hPa
|
2.90075
psi
|
210
hPa
|
3.04579
psi
|
220
hPa
|
3.19083
psi
|
230
hPa
|
3.33587
psi
|
240
hPa
|
3.4809
psi
|
250
hPa
|
3.62594
psi
|
260
hPa
|
3.77098
psi
|
270
hPa
|
3.91602
psi
|
280
hPa
|
4.06106
psi
|
290
hPa
|
4.20609
psi
|
300
hPa
|
4.35113
psi
|
310
hPa
|
4.49617
psi
|
320
hPa
|
4.64121
psi
|
330
hPa
|
4.78624
psi
|
340
hPa
|
4.93128
psi
|
350
hPa
|
5.07632
psi
|
360
hPa
|
5.22136
psi
|
370
hPa
|
5.36639
psi
|
380
hPa
|
5.51143
psi
|
390
hPa
|
5.65647
psi
|
400
hPa
|
5.80151
psi
|
410
hPa
|
5.94654
psi
|
420
hPa
|
6.09158
psi
|
430
hPa
|
6.23662
psi
|
440
hPa
|
6.38166
psi
|
450
hPa
|
6.5267
psi
|
460
hPa
|
6.67173
psi
|
470
hPa
|
6.81677
psi
|
480
hPa
|
6.96181
psi
|
490
hPa
|
7.10685
psi
|
500
hPa
|
7.25188
psi
|
510
hPa
|
7.39692
psi
|
520
hPa
|
7.54196
psi
|
530
hPa
|
7.687
psi
|
540
hPa
|
7.83203
psi
|
550
hPa
|
7.97707
psi
|
560
hPa
|
8.12211
psi
|
570
hPa
|
8.26715
psi
|
580
hPa
|
8.41219
psi
|
590
hPa
|
8.55722
psi
|
600
hPa
|
8.70226
psi
|
610
hPa
|
8.8473
psi
|
620
hPa
|
8.99234
psi
|
630
hPa
|
9.13737
psi
|
640
hPa
|
9.28241
psi
|
650
hPa
|
9.42745
psi
|
660
hPa
|
9.57249
psi
|
670
hPa
|
9.71752
psi
|
680
hPa
|
9.86256
psi
|
690
hPa
|
10.0076
psi
|
700
hPa
|
10.15264
psi
|
710
hPa
|
10.29768
psi
|
720
hPa
|
10.44271
psi
|
730
hPa
|
10.58775
psi
|
740
hPa
|
10.73279
psi
|
750
hPa
|
10.87783
psi
|
760
hPa
|
11.02286
psi
|
770
hPa
|
11.1679
psi
|
780
hPa
|
11.31294
psi
|
790
hPa
|
11.45798
psi
|
800
hPa
|
11.60301
psi
|
810
hPa
|
11.74805
psi
|
820
hPa
|
11.89309
psi
|
830
hPa
|
12.03813
psi
|
840
hPa
|
12.18317
psi
|
850
hPa
|
12.3282
psi
|
860
hPa
|
12.47324
psi
|
870
hPa
|
12.61828
psi
|
880
hPa
|
12.76332
psi
|
890
hPa
|
12.90835
psi
|
900
hPa
|
13.05339
psi
|
910
hPa
|
13.19843
psi
|
920
hPa
|
13.34347
psi
|
930
hPa
|
13.4885
psi
|
940
hPa
|
13.63354
psi
|
950
hPa
|
13.77858
psi
|
960
hPa
|
13.92362
psi
|
970
hPa
|
14.06866
psi
|
980
hPa
|
14.21369
psi
|
990
hPa
|
14.35873
psi
|
1000
hPa
|
14.50377
psi
|
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