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.
The kilopound per square inch (ksi) is a unit of pressure that is not as commonly encountered as its smaller counterpart, pounds per square inch (psi). However, it plays a crucial role in engineering and materials science, particularly in the United States, where it is often used to express the tensile strength and yield strength of materials like steel. One ksi is equal to 1,000 psi, making it a convenient way to express large values of pressure or stress without cumbersome zeros.
Interestingly, ksi is commonly used in the context of measuring the mechanical properties of metals, especially in aerospace and automotive industries. These are fields where precise and robust materials are essential for safety and performance. For instance, typical structural steel can have a yield strength on the order of 50 ksi, underscoring the immense stress materials can withstand in such applications. Understanding these units helps engineers ensure that the materials used can handle the demanding conditions they face.
Hectopascals | Kilopound per square inch |
---|---|
0
hPa
|
0
ksi
|
10
hPa
|
0.000145038
ksi
|
20
hPa
|
0.000290075
ksi
|
30
hPa
|
0.000435113
ksi
|
40
hPa
|
0.000580151
ksi
|
50
hPa
|
0.000725188
ksi
|
60
hPa
|
0.000870226
ksi
|
70
hPa
|
0.00101526
ksi
|
80
hPa
|
0.0011603
ksi
|
90
hPa
|
0.00130534
ksi
|
100
hPa
|
0.00145038
ksi
|
110
hPa
|
0.00159541
ksi
|
120
hPa
|
0.00174045
ksi
|
130
hPa
|
0.00188549
ksi
|
140
hPa
|
0.00203053
ksi
|
150
hPa
|
0.00217557
ksi
|
160
hPa
|
0.0023206
ksi
|
170
hPa
|
0.00246564
ksi
|
180
hPa
|
0.00261068
ksi
|
190
hPa
|
0.00275572
ksi
|
200
hPa
|
0.00290075
ksi
|
210
hPa
|
0.00304579
ksi
|
220
hPa
|
0.00319083
ksi
|
230
hPa
|
0.00333587
ksi
|
240
hPa
|
0.0034809
ksi
|
250
hPa
|
0.00362594
ksi
|
260
hPa
|
0.00377098
ksi
|
270
hPa
|
0.00391602
ksi
|
280
hPa
|
0.00406106
ksi
|
290
hPa
|
0.00420609
ksi
|
300
hPa
|
0.00435113
ksi
|
310
hPa
|
0.00449617
ksi
|
320
hPa
|
0.00464121
ksi
|
330
hPa
|
0.00478624
ksi
|
340
hPa
|
0.00493128
ksi
|
350
hPa
|
0.00507632
ksi
|
360
hPa
|
0.00522136
ksi
|
370
hPa
|
0.00536639
ksi
|
380
hPa
|
0.00551143
ksi
|
390
hPa
|
0.00565647
ksi
|
400
hPa
|
0.00580151
ksi
|
410
hPa
|
0.00594654
ksi
|
420
hPa
|
0.00609158
ksi
|
430
hPa
|
0.00623662
ksi
|
440
hPa
|
0.00638166
ksi
|
450
hPa
|
0.0065267
ksi
|
460
hPa
|
0.00667173
ksi
|
470
hPa
|
0.00681677
ksi
|
480
hPa
|
0.00696181
ksi
|
490
hPa
|
0.00710685
ksi
|
500
hPa
|
0.00725188
ksi
|
510
hPa
|
0.00739692
ksi
|
520
hPa
|
0.00754196
ksi
|
530
hPa
|
0.007687
ksi
|
540
hPa
|
0.00783203
ksi
|
550
hPa
|
0.00797707
ksi
|
560
hPa
|
0.00812211
ksi
|
570
hPa
|
0.00826715
ksi
|
580
hPa
|
0.00841219
ksi
|
590
hPa
|
0.00855722
ksi
|
600
hPa
|
0.00870226
ksi
|
610
hPa
|
0.0088473
ksi
|
620
hPa
|
0.00899234
ksi
|
630
hPa
|
0.00913737
ksi
|
640
hPa
|
0.00928241
ksi
|
650
hPa
|
0.00942745
ksi
|
660
hPa
|
0.00957249
ksi
|
670
hPa
|
0.00971752
ksi
|
680
hPa
|
0.00986256
ksi
|
690
hPa
|
0.0100076
ksi
|
700
hPa
|
0.0101526
ksi
|
710
hPa
|
0.0102977
ksi
|
720
hPa
|
0.0104427
ksi
|
730
hPa
|
0.0105878
ksi
|
740
hPa
|
0.0107328
ksi
|
750
hPa
|
0.0108778
ksi
|
760
hPa
|
0.0110229
ksi
|
770
hPa
|
0.0111679
ksi
|
780
hPa
|
0.0113129
ksi
|
790
hPa
|
0.011458
ksi
|
800
hPa
|
0.011603
ksi
|
810
hPa
|
0.0117481
ksi
|
820
hPa
|
0.0118931
ksi
|
830
hPa
|
0.0120381
ksi
|
840
hPa
|
0.0121832
ksi
|
850
hPa
|
0.0123282
ksi
|
860
hPa
|
0.0124732
ksi
|
870
hPa
|
0.0126183
ksi
|
880
hPa
|
0.0127633
ksi
|
890
hPa
|
0.0129084
ksi
|
900
hPa
|
0.0130534
ksi
|
910
hPa
|
0.0131984
ksi
|
920
hPa
|
0.0133435
ksi
|
930
hPa
|
0.0134885
ksi
|
940
hPa
|
0.0136335
ksi
|
950
hPa
|
0.0137786
ksi
|
960
hPa
|
0.0139236
ksi
|
970
hPa
|
0.0140687
ksi
|
980
hPa
|
0.0142137
ksi
|
990
hPa
|
0.0143587
ksi
|
1000
hPa
|
0.0145038
ksi
|
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