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 torr is a unit of pressure named after the Italian physicist Evangelista Torricelli, who invented the barometer in the 17th century. It is defined as 1/760th of an atmosphere, approximating the pressure exerted by a one-millimeter column of mercury at 0 degrees Celsius. What makes the torr particularly interesting is its practical use in fields like vacuum technology and weather forecasting, where precise measurements of atmospheric pressure are crucial.
The legacy of Torricelli’s work is integral to meteorology and physics, as it opened paths for understanding atmospheric pressure. Beyond scientific circles, the torr is a reminder of human ingenuity in unraveling atmospheric mysteries and continues to play a vital role in today’s scientific advancements.
Hectopascals | Torr |
---|---|
0
hPa
|
0
torr
|
10
hPa
|
7.50062
torr
|
20
hPa
|
15.00123
torr
|
30
hPa
|
22.50185
torr
|
40
hPa
|
30.00247
torr
|
50
hPa
|
37.50308
torr
|
60
hPa
|
45.0037
torr
|
70
hPa
|
52.50432
torr
|
80
hPa
|
60.00493
torr
|
90
hPa
|
67.50555
torr
|
100
hPa
|
75.00617
torr
|
110
hPa
|
82.50679
torr
|
120
hPa
|
90.0074
torr
|
130
hPa
|
97.50802
torr
|
140
hPa
|
105.00864
torr
|
150
hPa
|
112.50925
torr
|
160
hPa
|
120.00987
torr
|
170
hPa
|
127.51049
torr
|
180
hPa
|
135.0111
torr
|
190
hPa
|
142.51172
torr
|
200
hPa
|
150.01234
torr
|
210
hPa
|
157.51295
torr
|
220
hPa
|
165.01357
torr
|
230
hPa
|
172.51419
torr
|
240
hPa
|
180.0148
torr
|
250
hPa
|
187.51542
torr
|
260
hPa
|
195.01604
torr
|
270
hPa
|
202.51665
torr
|
280
hPa
|
210.01727
torr
|
290
hPa
|
217.51789
torr
|
300
hPa
|
225.0185
torr
|
310
hPa
|
232.51912
torr
|
320
hPa
|
240.01974
torr
|
330
hPa
|
247.52036
torr
|
340
hPa
|
255.02097
torr
|
350
hPa
|
262.52159
torr
|
360
hPa
|
270.02221
torr
|
370
hPa
|
277.52282
torr
|
380
hPa
|
285.02344
torr
|
390
hPa
|
292.52406
torr
|
400
hPa
|
300.02467
torr
|
410
hPa
|
307.52529
torr
|
420
hPa
|
315.02591
torr
|
430
hPa
|
322.52652
torr
|
440
hPa
|
330.02714
torr
|
450
hPa
|
337.52776
torr
|
460
hPa
|
345.02837
torr
|
470
hPa
|
352.52899
torr
|
480
hPa
|
360.02961
torr
|
490
hPa
|
367.53022
torr
|
500
hPa
|
375.03084
torr
|
510
hPa
|
382.53146
torr
|
520
hPa
|
390.03208
torr
|
530
hPa
|
397.53269
torr
|
540
hPa
|
405.03331
torr
|
550
hPa
|
412.53393
torr
|
560
hPa
|
420.03454
torr
|
570
hPa
|
427.53516
torr
|
580
hPa
|
435.03578
torr
|
590
hPa
|
442.53639
torr
|
600
hPa
|
450.03701
torr
|
610
hPa
|
457.53763
torr
|
620
hPa
|
465.03824
torr
|
630
hPa
|
472.53886
torr
|
640
hPa
|
480.03948
torr
|
650
hPa
|
487.54009
torr
|
660
hPa
|
495.04071
torr
|
670
hPa
|
502.54133
torr
|
680
hPa
|
510.04194
torr
|
690
hPa
|
517.54256
torr
|
700
hPa
|
525.04318
torr
|
710
hPa
|
532.54379
torr
|
720
hPa
|
540.04441
torr
|
730
hPa
|
547.54503
torr
|
740
hPa
|
555.04565
torr
|
750
hPa
|
562.54626
torr
|
760
hPa
|
570.04688
torr
|
770
hPa
|
577.5475
torr
|
780
hPa
|
585.04811
torr
|
790
hPa
|
592.54873
torr
|
800
hPa
|
600.04935
torr
|
810
hPa
|
607.54996
torr
|
820
hPa
|
615.05058
torr
|
830
hPa
|
622.5512
torr
|
840
hPa
|
630.05181
torr
|
850
hPa
|
637.55243
torr
|
860
hPa
|
645.05305
torr
|
870
hPa
|
652.55366
torr
|
880
hPa
|
660.05428
torr
|
890
hPa
|
667.5549
torr
|
900
hPa
|
675.05551
torr
|
910
hPa
|
682.55613
torr
|
920
hPa
|
690.05675
torr
|
930
hPa
|
697.55736
torr
|
940
hPa
|
705.05798
torr
|
950
hPa
|
712.5586
torr
|
960
hPa
|
720.05922
torr
|
970
hPa
|
727.55983
torr
|
980
hPa
|
735.06045
torr
|
990
hPa
|
742.56107
torr
|
1000
hPa
|
750.06168
torr
|
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