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 “bar” is a metric unit of pressure, commonly used in meteorology to describe atmospheric pressure — one bar is approximately equal to the atmospheric pressure on Earth at sea level. Interestingly, the term “bar” originates from the Greek word “baros,” meaning weight. This unit is not only practical for forecasting weather but also critical in various scientific fields, such as oceanography and engineering, where accurate pressure measurements are crucial.
A fascinating aspect of the bar is its application in scuba diving. Divers often use bar to read their submersible pressure gauges to monitor air consumption. Moreover, understanding bar pressure changes is essential in deep-sea diving to avoid decompression sickness, a condition caused by rapid changes in pressure. Thus, the bar is a pivotal unit in both scientific and everyday contexts.
| Millibar | Bar |
|---|---|
0
mbar
|
0
bar
|
10
mbar
|
0.01
bar
|
20
mbar
|
0.02
bar
|
30
mbar
|
0.03
bar
|
40
mbar
|
0.04
bar
|
50
mbar
|
0.05
bar
|
60
mbar
|
0.06
bar
|
70
mbar
|
0.07
bar
|
80
mbar
|
0.08
bar
|
90
mbar
|
0.09
bar
|
100
mbar
|
0.1
bar
|
110
mbar
|
0.11
bar
|
120
mbar
|
0.12
bar
|
130
mbar
|
0.13
bar
|
140
mbar
|
0.14
bar
|
150
mbar
|
0.15
bar
|
160
mbar
|
0.16
bar
|
170
mbar
|
0.17
bar
|
180
mbar
|
0.18
bar
|
190
mbar
|
0.19
bar
|
200
mbar
|
0.2
bar
|
210
mbar
|
0.21
bar
|
220
mbar
|
0.22
bar
|
230
mbar
|
0.23
bar
|
240
mbar
|
0.24
bar
|
250
mbar
|
0.25
bar
|
260
mbar
|
0.26
bar
|
270
mbar
|
0.27
bar
|
280
mbar
|
0.28
bar
|
290
mbar
|
0.29
bar
|
300
mbar
|
0.3
bar
|
310
mbar
|
0.31
bar
|
320
mbar
|
0.32
bar
|
330
mbar
|
0.33
bar
|
340
mbar
|
0.34
bar
|
350
mbar
|
0.35
bar
|
360
mbar
|
0.36
bar
|
370
mbar
|
0.37
bar
|
380
mbar
|
0.38
bar
|
390
mbar
|
0.39
bar
|
400
mbar
|
0.4
bar
|
410
mbar
|
0.41
bar
|
420
mbar
|
0.42
bar
|
430
mbar
|
0.43
bar
|
440
mbar
|
0.44
bar
|
450
mbar
|
0.45
bar
|
460
mbar
|
0.46
bar
|
470
mbar
|
0.47
bar
|
480
mbar
|
0.48
bar
|
490
mbar
|
0.49
bar
|
500
mbar
|
0.5
bar
|
510
mbar
|
0.51
bar
|
520
mbar
|
0.52
bar
|
530
mbar
|
0.53
bar
|
540
mbar
|
0.54
bar
|
550
mbar
|
0.55
bar
|
560
mbar
|
0.56
bar
|
570
mbar
|
0.57
bar
|
580
mbar
|
0.58
bar
|
590
mbar
|
0.59
bar
|
600
mbar
|
0.6
bar
|
610
mbar
|
0.61
bar
|
620
mbar
|
0.62
bar
|
630
mbar
|
0.63
bar
|
640
mbar
|
0.64
bar
|
650
mbar
|
0.65
bar
|
660
mbar
|
0.66
bar
|
670
mbar
|
0.67
bar
|
680
mbar
|
0.68
bar
|
690
mbar
|
0.69
bar
|
700
mbar
|
0.7
bar
|
710
mbar
|
0.71
bar
|
720
mbar
|
0.72
bar
|
730
mbar
|
0.73
bar
|
740
mbar
|
0.74
bar
|
750
mbar
|
0.75
bar
|
760
mbar
|
0.76
bar
|
770
mbar
|
0.77
bar
|
780
mbar
|
0.78
bar
|
790
mbar
|
0.79
bar
|
800
mbar
|
0.8
bar
|
810
mbar
|
0.81
bar
|
820
mbar
|
0.82
bar
|
830
mbar
|
0.83
bar
|
840
mbar
|
0.84
bar
|
850
mbar
|
0.85
bar
|
860
mbar
|
0.86
bar
|
870
mbar
|
0.87
bar
|
880
mbar
|
0.88
bar
|
890
mbar
|
0.89
bar
|
900
mbar
|
0.9
bar
|
910
mbar
|
0.91
bar
|
920
mbar
|
0.92
bar
|
930
mbar
|
0.93
bar
|
940
mbar
|
0.94
bar
|
950
mbar
|
0.95
bar
|
960
mbar
|
0.96
bar
|
970
mbar
|
0.97
bar
|
980
mbar
|
0.98
bar
|
990
mbar
|
0.99
bar
|
1000
mbar
|
1
bar
|
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