The millibar, a unit of pressure, traces its origins back to the 1800s when it was introduced by the meteorologists Henry H. Hilderbrandsson and Vagn Walfrid Ekman. Used primarily in meteorology, the millibar found its place in daily weather reports around the world. Measuring atmospheric pressure in thousands, one millibar equates to 100 pascals in the SI system, providing a convenient scale for understanding variations in atmospheric conditions.
Intriguingly, the typical sea-level atmospheric pressure is about 1013 millibars. This is the weight of the air around us, controlled by a delicate balance of gases and climatic factors. During severe weather events, such as hurricanes, the central pressure can drastically drop to around 920 millibars, signifying powerful winds and storms. This makes the millibar not just a scientific measure, but a crucial tool for predicting and understanding weather patterns.
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.
Millibar | Pascals |
---|---|
0
mbar
|
0
Pa
|
10
mbar
|
1000
Pa
|
20
mbar
|
2000
Pa
|
30
mbar
|
3000
Pa
|
40
mbar
|
4000
Pa
|
50
mbar
|
5000
Pa
|
60
mbar
|
6000
Pa
|
70
mbar
|
7000
Pa
|
80
mbar
|
8000
Pa
|
90
mbar
|
9000
Pa
|
100
mbar
|
10000
Pa
|
110
mbar
|
11000
Pa
|
120
mbar
|
12000
Pa
|
130
mbar
|
13000
Pa
|
140
mbar
|
14000
Pa
|
150
mbar
|
15000
Pa
|
160
mbar
|
16000
Pa
|
170
mbar
|
17000
Pa
|
180
mbar
|
18000
Pa
|
190
mbar
|
19000
Pa
|
200
mbar
|
20000
Pa
|
210
mbar
|
21000
Pa
|
220
mbar
|
22000
Pa
|
230
mbar
|
23000
Pa
|
240
mbar
|
24000
Pa
|
250
mbar
|
25000
Pa
|
260
mbar
|
26000
Pa
|
270
mbar
|
27000
Pa
|
280
mbar
|
28000
Pa
|
290
mbar
|
29000
Pa
|
300
mbar
|
30000
Pa
|
310
mbar
|
31000
Pa
|
320
mbar
|
32000
Pa
|
330
mbar
|
33000
Pa
|
340
mbar
|
34000
Pa
|
350
mbar
|
35000
Pa
|
360
mbar
|
36000
Pa
|
370
mbar
|
37000
Pa
|
380
mbar
|
38000
Pa
|
390
mbar
|
39000
Pa
|
400
mbar
|
40000
Pa
|
410
mbar
|
41000
Pa
|
420
mbar
|
42000
Pa
|
430
mbar
|
43000
Pa
|
440
mbar
|
44000
Pa
|
450
mbar
|
45000
Pa
|
460
mbar
|
46000
Pa
|
470
mbar
|
47000
Pa
|
480
mbar
|
48000
Pa
|
490
mbar
|
49000
Pa
|
500
mbar
|
50000
Pa
|
510
mbar
|
51000
Pa
|
520
mbar
|
52000
Pa
|
530
mbar
|
53000
Pa
|
540
mbar
|
54000
Pa
|
550
mbar
|
55000
Pa
|
560
mbar
|
56000
Pa
|
570
mbar
|
57000
Pa
|
580
mbar
|
58000
Pa
|
590
mbar
|
59000
Pa
|
600
mbar
|
60000
Pa
|
610
mbar
|
61000
Pa
|
620
mbar
|
62000
Pa
|
630
mbar
|
63000
Pa
|
640
mbar
|
64000
Pa
|
650
mbar
|
65000
Pa
|
660
mbar
|
66000
Pa
|
670
mbar
|
67000
Pa
|
680
mbar
|
68000
Pa
|
690
mbar
|
69000
Pa
|
700
mbar
|
70000
Pa
|
710
mbar
|
71000
Pa
|
720
mbar
|
72000
Pa
|
730
mbar
|
73000
Pa
|
740
mbar
|
74000
Pa
|
750
mbar
|
75000
Pa
|
760
mbar
|
76000
Pa
|
770
mbar
|
77000
Pa
|
780
mbar
|
78000
Pa
|
790
mbar
|
79000
Pa
|
800
mbar
|
80000
Pa
|
810
mbar
|
81000
Pa
|
820
mbar
|
82000
Pa
|
830
mbar
|
83000
Pa
|
840
mbar
|
84000
Pa
|
850
mbar
|
85000
Pa
|
860
mbar
|
86000
Pa
|
870
mbar
|
87000
Pa
|
880
mbar
|
88000
Pa
|
890
mbar
|
89000
Pa
|
900
mbar
|
90000
Pa
|
910
mbar
|
91000
Pa
|
920
mbar
|
92000
Pa
|
930
mbar
|
93000
Pa
|
940
mbar
|
94000
Pa
|
950
mbar
|
95000
Pa
|
960
mbar
|
96000
Pa
|
970
mbar
|
97000
Pa
|
980
mbar
|
98000
Pa
|
990
mbar
|
99000
Pa
|
1000
mbar
|
100000
Pa
|
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