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 kilopound per square inch (ksi) is a unit of pressure that is not as commonly encountered as its smaller counterpart, pounds per square inch (psi). However, it plays a crucial role in engineering and materials science, particularly in the United States, where it is often used to express the tensile strength and yield strength of materials like steel. One ksi is equal to 1,000 psi, making it a convenient way to express large values of pressure or stress without cumbersome zeros.
Interestingly, ksi is commonly used in the context of measuring the mechanical properties of metals, especially in aerospace and automotive industries. These are fields where precise and robust materials are essential for safety and performance. For instance, typical structural steel can have a yield strength on the order of 50 ksi, underscoring the immense stress materials can withstand in such applications. Understanding these units helps engineers ensure that the materials used can handle the demanding conditions they face.
Bar | Kilopound per square inch |
---|---|
0
bar
|
0
ksi
|
1
bar
|
0.0145038
ksi
|
2
bar
|
0.0290075
ksi
|
3
bar
|
0.0435113
ksi
|
4
bar
|
0.0580151
ksi
|
5
bar
|
0.0725188
ksi
|
6
bar
|
0.0870226
ksi
|
7
bar
|
0.101526
ksi
|
8
bar
|
0.11603
ksi
|
9
bar
|
0.130534
ksi
|
10
bar
|
0.145038
ksi
|
11
bar
|
0.159541
ksi
|
12
bar
|
0.174045
ksi
|
13
bar
|
0.188549
ksi
|
14
bar
|
0.203053
ksi
|
15
bar
|
0.217557
ksi
|
16
bar
|
0.23206
ksi
|
17
bar
|
0.246564
ksi
|
18
bar
|
0.261068
ksi
|
19
bar
|
0.275572
ksi
|
20
bar
|
0.290075
ksi
|
21
bar
|
0.304579
ksi
|
22
bar
|
0.319083
ksi
|
23
bar
|
0.333587
ksi
|
24
bar
|
0.34809
ksi
|
25
bar
|
0.362594
ksi
|
26
bar
|
0.377098
ksi
|
27
bar
|
0.391602
ksi
|
28
bar
|
0.406106
ksi
|
29
bar
|
0.420609
ksi
|
30
bar
|
0.435113
ksi
|
31
bar
|
0.449617
ksi
|
32
bar
|
0.464121
ksi
|
33
bar
|
0.478624
ksi
|
34
bar
|
0.493128
ksi
|
35
bar
|
0.507632
ksi
|
36
bar
|
0.522136
ksi
|
37
bar
|
0.536639
ksi
|
38
bar
|
0.551143
ksi
|
39
bar
|
0.565647
ksi
|
40
bar
|
0.580151
ksi
|
41
bar
|
0.594654
ksi
|
42
bar
|
0.609158
ksi
|
43
bar
|
0.623662
ksi
|
44
bar
|
0.638166
ksi
|
45
bar
|
0.65267
ksi
|
46
bar
|
0.667173
ksi
|
47
bar
|
0.681677
ksi
|
48
bar
|
0.696181
ksi
|
49
bar
|
0.710685
ksi
|
50
bar
|
0.725188
ksi
|
51
bar
|
0.739692
ksi
|
52
bar
|
0.754196
ksi
|
53
bar
|
0.7687
ksi
|
54
bar
|
0.783203
ksi
|
55
bar
|
0.797707
ksi
|
56
bar
|
0.812211
ksi
|
57
bar
|
0.826715
ksi
|
58
bar
|
0.841219
ksi
|
59
bar
|
0.855722
ksi
|
60
bar
|
0.870226
ksi
|
61
bar
|
0.88473
ksi
|
62
bar
|
0.899234
ksi
|
63
bar
|
0.913737
ksi
|
64
bar
|
0.928241
ksi
|
65
bar
|
0.942745
ksi
|
66
bar
|
0.957249
ksi
|
67
bar
|
0.971752
ksi
|
68
bar
|
0.986256
ksi
|
69
bar
|
1.00076
ksi
|
70
bar
|
1.01526
ksi
|
71
bar
|
1.02977
ksi
|
72
bar
|
1.04427
ksi
|
73
bar
|
1.05878
ksi
|
74
bar
|
1.07328
ksi
|
75
bar
|
1.08778
ksi
|
76
bar
|
1.10229
ksi
|
77
bar
|
1.11679
ksi
|
78
bar
|
1.13129
ksi
|
79
bar
|
1.1458
ksi
|
80
bar
|
1.1603
ksi
|
81
bar
|
1.17481
ksi
|
82
bar
|
1.18931
ksi
|
83
bar
|
1.20381
ksi
|
84
bar
|
1.21832
ksi
|
85
bar
|
1.23282
ksi
|
86
bar
|
1.24732
ksi
|
87
bar
|
1.26183
ksi
|
88
bar
|
1.27633
ksi
|
89
bar
|
1.29084
ksi
|
90
bar
|
1.30534
ksi
|
91
bar
|
1.31984
ksi
|
92
bar
|
1.33435
ksi
|
93
bar
|
1.34885
ksi
|
94
bar
|
1.36335
ksi
|
95
bar
|
1.37786
ksi
|
96
bar
|
1.39236
ksi
|
97
bar
|
1.40687
ksi
|
98
bar
|
1.42137
ksi
|
99
bar
|
1.43587
ksi
|
100
bar
|
1.45038
ksi
|
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