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.
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.
Bar | Millibar |
---|---|
0
bar
|
0
mbar
|
1
bar
|
1000
mbar
|
2
bar
|
2000
mbar
|
3
bar
|
3000
mbar
|
4
bar
|
4000
mbar
|
5
bar
|
5000
mbar
|
6
bar
|
6000
mbar
|
7
bar
|
7000
mbar
|
8
bar
|
8000
mbar
|
9
bar
|
9000
mbar
|
10
bar
|
10000
mbar
|
11
bar
|
11000
mbar
|
12
bar
|
12000
mbar
|
13
bar
|
13000
mbar
|
14
bar
|
14000
mbar
|
15
bar
|
15000
mbar
|
16
bar
|
16000
mbar
|
17
bar
|
17000
mbar
|
18
bar
|
18000
mbar
|
19
bar
|
19000
mbar
|
20
bar
|
20000
mbar
|
21
bar
|
21000
mbar
|
22
bar
|
22000
mbar
|
23
bar
|
23000
mbar
|
24
bar
|
24000
mbar
|
25
bar
|
25000
mbar
|
26
bar
|
26000
mbar
|
27
bar
|
27000
mbar
|
28
bar
|
28000
mbar
|
29
bar
|
29000
mbar
|
30
bar
|
30000
mbar
|
31
bar
|
31000
mbar
|
32
bar
|
32000
mbar
|
33
bar
|
33000
mbar
|
34
bar
|
34000
mbar
|
35
bar
|
35000
mbar
|
36
bar
|
36000
mbar
|
37
bar
|
37000
mbar
|
38
bar
|
38000
mbar
|
39
bar
|
39000
mbar
|
40
bar
|
40000
mbar
|
41
bar
|
41000
mbar
|
42
bar
|
42000
mbar
|
43
bar
|
43000
mbar
|
44
bar
|
44000
mbar
|
45
bar
|
45000
mbar
|
46
bar
|
46000
mbar
|
47
bar
|
47000
mbar
|
48
bar
|
48000
mbar
|
49
bar
|
49000
mbar
|
50
bar
|
50000
mbar
|
51
bar
|
51000
mbar
|
52
bar
|
52000
mbar
|
53
bar
|
53000
mbar
|
54
bar
|
54000
mbar
|
55
bar
|
55000
mbar
|
56
bar
|
56000
mbar
|
57
bar
|
57000
mbar
|
58
bar
|
58000
mbar
|
59
bar
|
59000
mbar
|
60
bar
|
60000
mbar
|
61
bar
|
61000
mbar
|
62
bar
|
62000
mbar
|
63
bar
|
63000
mbar
|
64
bar
|
64000
mbar
|
65
bar
|
65000
mbar
|
66
bar
|
66000
mbar
|
67
bar
|
67000
mbar
|
68
bar
|
68000
mbar
|
69
bar
|
69000
mbar
|
70
bar
|
70000
mbar
|
71
bar
|
71000
mbar
|
72
bar
|
72000
mbar
|
73
bar
|
73000
mbar
|
74
bar
|
74000
mbar
|
75
bar
|
75000
mbar
|
76
bar
|
76000
mbar
|
77
bar
|
77000
mbar
|
78
bar
|
78000
mbar
|
79
bar
|
79000
mbar
|
80
bar
|
80000
mbar
|
81
bar
|
81000
mbar
|
82
bar
|
82000
mbar
|
83
bar
|
83000
mbar
|
84
bar
|
84000
mbar
|
85
bar
|
85000
mbar
|
86
bar
|
86000
mbar
|
87
bar
|
87000
mbar
|
88
bar
|
88000
mbar
|
89
bar
|
89000
mbar
|
90
bar
|
90000
mbar
|
91
bar
|
91000
mbar
|
92
bar
|
92000
mbar
|
93
bar
|
93000
mbar
|
94
bar
|
94000
mbar
|
95
bar
|
95000
mbar
|
96
bar
|
96000
mbar
|
97
bar
|
97000
mbar
|
98
bar
|
98000
mbar
|
99
bar
|
99000
mbar
|
100
bar
|
100000
mbar
|
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