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 Pascal, named after the French mathematician and physicist Blaise Pascal, is the SI unit of pressure. It is equivalent to one newton per square meter, symbolized as Pa. Despite its relatively recent introduction in 1971, the Pascal honors the pioneering work of Pascal in fluid mechanics and pressure, such as Pascal’s Law, which explains how pressure applied to a confined fluid is transmitted undiminished in all directions. Interestingly, a single Pascal is a tiny unit of pressure, roughly equal to the pressure exerted by a dollar bill resting flat on a table. This illustrates why everyday atmospheric pressure is typically measured in kilopascals (kPa), as one standard atmosphere is about 101.3 kPa.
Hectopascals | Pascals |
---|---|
0
hPa
|
0
Pa
|
10
hPa
|
1000
Pa
|
20
hPa
|
2000
Pa
|
30
hPa
|
3000
Pa
|
40
hPa
|
4000
Pa
|
50
hPa
|
5000
Pa
|
60
hPa
|
6000
Pa
|
70
hPa
|
7000
Pa
|
80
hPa
|
8000
Pa
|
90
hPa
|
9000
Pa
|
100
hPa
|
10000
Pa
|
110
hPa
|
11000
Pa
|
120
hPa
|
12000
Pa
|
130
hPa
|
13000
Pa
|
140
hPa
|
14000
Pa
|
150
hPa
|
15000
Pa
|
160
hPa
|
16000
Pa
|
170
hPa
|
17000
Pa
|
180
hPa
|
18000
Pa
|
190
hPa
|
19000
Pa
|
200
hPa
|
20000
Pa
|
210
hPa
|
21000
Pa
|
220
hPa
|
22000
Pa
|
230
hPa
|
23000
Pa
|
240
hPa
|
24000
Pa
|
250
hPa
|
25000
Pa
|
260
hPa
|
26000
Pa
|
270
hPa
|
27000
Pa
|
280
hPa
|
28000
Pa
|
290
hPa
|
29000
Pa
|
300
hPa
|
30000
Pa
|
310
hPa
|
31000
Pa
|
320
hPa
|
32000
Pa
|
330
hPa
|
33000
Pa
|
340
hPa
|
34000
Pa
|
350
hPa
|
35000
Pa
|
360
hPa
|
36000
Pa
|
370
hPa
|
37000
Pa
|
380
hPa
|
38000
Pa
|
390
hPa
|
39000
Pa
|
400
hPa
|
40000
Pa
|
410
hPa
|
41000
Pa
|
420
hPa
|
42000
Pa
|
430
hPa
|
43000
Pa
|
440
hPa
|
44000
Pa
|
450
hPa
|
45000
Pa
|
460
hPa
|
46000
Pa
|
470
hPa
|
47000
Pa
|
480
hPa
|
48000
Pa
|
490
hPa
|
49000
Pa
|
500
hPa
|
50000
Pa
|
510
hPa
|
51000
Pa
|
520
hPa
|
52000
Pa
|
530
hPa
|
53000
Pa
|
540
hPa
|
54000
Pa
|
550
hPa
|
55000
Pa
|
560
hPa
|
56000
Pa
|
570
hPa
|
57000
Pa
|
580
hPa
|
58000
Pa
|
590
hPa
|
59000
Pa
|
600
hPa
|
60000
Pa
|
610
hPa
|
61000
Pa
|
620
hPa
|
62000
Pa
|
630
hPa
|
63000
Pa
|
640
hPa
|
64000
Pa
|
650
hPa
|
65000
Pa
|
660
hPa
|
66000
Pa
|
670
hPa
|
67000
Pa
|
680
hPa
|
68000
Pa
|
690
hPa
|
69000
Pa
|
700
hPa
|
70000
Pa
|
710
hPa
|
71000
Pa
|
720
hPa
|
72000
Pa
|
730
hPa
|
73000
Pa
|
740
hPa
|
74000
Pa
|
750
hPa
|
75000
Pa
|
760
hPa
|
76000
Pa
|
770
hPa
|
77000
Pa
|
780
hPa
|
78000
Pa
|
790
hPa
|
79000
Pa
|
800
hPa
|
80000
Pa
|
810
hPa
|
81000
Pa
|
820
hPa
|
82000
Pa
|
830
hPa
|
83000
Pa
|
840
hPa
|
84000
Pa
|
850
hPa
|
85000
Pa
|
860
hPa
|
86000
Pa
|
870
hPa
|
87000
Pa
|
880
hPa
|
88000
Pa
|
890
hPa
|
89000
Pa
|
900
hPa
|
90000
Pa
|
910
hPa
|
91000
Pa
|
920
hPa
|
92000
Pa
|
930
hPa
|
93000
Pa
|
940
hPa
|
94000
Pa
|
950
hPa
|
95000
Pa
|
960
hPa
|
96000
Pa
|
970
hPa
|
97000
Pa
|
980
hPa
|
98000
Pa
|
990
hPa
|
99000
Pa
|
1000
hPa
|
100000
Pa
|
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