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 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.
Bar | Pascals |
---|---|
0
bar
|
0
Pa
|
1
bar
|
100000
Pa
|
2
bar
|
200000
Pa
|
3
bar
|
300000
Pa
|
4
bar
|
400000
Pa
|
5
bar
|
500000
Pa
|
6
bar
|
600000
Pa
|
7
bar
|
700000
Pa
|
8
bar
|
800000
Pa
|
9
bar
|
900000
Pa
|
10
bar
|
1000000
Pa
|
11
bar
|
1100000
Pa
|
12
bar
|
1200000
Pa
|
13
bar
|
1300000
Pa
|
14
bar
|
1400000
Pa
|
15
bar
|
1500000
Pa
|
16
bar
|
1600000
Pa
|
17
bar
|
1700000
Pa
|
18
bar
|
1800000
Pa
|
19
bar
|
1900000
Pa
|
20
bar
|
2000000
Pa
|
21
bar
|
2100000
Pa
|
22
bar
|
2200000
Pa
|
23
bar
|
2300000
Pa
|
24
bar
|
2400000
Pa
|
25
bar
|
2500000
Pa
|
26
bar
|
2600000
Pa
|
27
bar
|
2700000
Pa
|
28
bar
|
2800000
Pa
|
29
bar
|
2900000
Pa
|
30
bar
|
3000000
Pa
|
31
bar
|
3100000
Pa
|
32
bar
|
3200000
Pa
|
33
bar
|
3300000
Pa
|
34
bar
|
3400000
Pa
|
35
bar
|
3500000
Pa
|
36
bar
|
3600000
Pa
|
37
bar
|
3700000
Pa
|
38
bar
|
3800000
Pa
|
39
bar
|
3900000
Pa
|
40
bar
|
4000000
Pa
|
41
bar
|
4100000
Pa
|
42
bar
|
4200000
Pa
|
43
bar
|
4300000
Pa
|
44
bar
|
4400000
Pa
|
45
bar
|
4500000
Pa
|
46
bar
|
4600000
Pa
|
47
bar
|
4700000
Pa
|
48
bar
|
4800000
Pa
|
49
bar
|
4900000
Pa
|
50
bar
|
5000000
Pa
|
51
bar
|
5100000
Pa
|
52
bar
|
5200000
Pa
|
53
bar
|
5300000
Pa
|
54
bar
|
5400000
Pa
|
55
bar
|
5500000
Pa
|
56
bar
|
5600000
Pa
|
57
bar
|
5700000
Pa
|
58
bar
|
5800000
Pa
|
59
bar
|
5900000
Pa
|
60
bar
|
6000000
Pa
|
61
bar
|
6100000
Pa
|
62
bar
|
6200000
Pa
|
63
bar
|
6300000
Pa
|
64
bar
|
6400000
Pa
|
65
bar
|
6500000
Pa
|
66
bar
|
6600000
Pa
|
67
bar
|
6700000
Pa
|
68
bar
|
6800000
Pa
|
69
bar
|
6900000
Pa
|
70
bar
|
7000000
Pa
|
71
bar
|
7100000
Pa
|
72
bar
|
7200000
Pa
|
73
bar
|
7300000
Pa
|
74
bar
|
7400000
Pa
|
75
bar
|
7500000
Pa
|
76
bar
|
7600000
Pa
|
77
bar
|
7700000
Pa
|
78
bar
|
7800000
Pa
|
79
bar
|
7900000
Pa
|
80
bar
|
8000000
Pa
|
81
bar
|
8100000
Pa
|
82
bar
|
8200000
Pa
|
83
bar
|
8300000
Pa
|
84
bar
|
8400000
Pa
|
85
bar
|
8500000
Pa
|
86
bar
|
8600000
Pa
|
87
bar
|
8700000
Pa
|
88
bar
|
8800000
Pa
|
89
bar
|
8900000
Pa
|
90
bar
|
9000000
Pa
|
91
bar
|
9100000
Pa
|
92
bar
|
9200000
Pa
|
93
bar
|
9300000
Pa
|
94
bar
|
9400000
Pa
|
95
bar
|
9500000
Pa
|
96
bar
|
9600000
Pa
|
97
bar
|
9700000
Pa
|
98
bar
|
9800000
Pa
|
99
bar
|
9900000
Pa
|
100
bar
|
1e+7
Pa
|
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