A “meter of water @ 4°C” is a unique unit used primarily to measure pressure. At this specific temperature, water reaches its maximum density, and the pressure exerted by a one-meter column of water is approximately 9.81 kilopascals or 0.0979 atmospheres. This scenario represents the optimal conditions for standardizing pressure measurements because the physical properties of water are most stable, reducing variances in calculations.
This unit is especially important in fields like plumbing and hydraulics, where accurate pressure measurements are crucial. Understanding these principles can lead to better designs in water distribution systems, preventing common issues such as pipe bursts or inefficient water flow, ensuring systems operate safely and efficiently.
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.
Meters of water @ 4°C | Bar |
---|---|
0
mH₂O
|
0
bar
|
1
mH₂O
|
0.0980665
bar
|
2
mH₂O
|
0.196133
bar
|
3
mH₂O
|
0.2942
bar
|
4
mH₂O
|
0.392266
bar
|
5
mH₂O
|
0.490332
bar
|
6
mH₂O
|
0.588399
bar
|
7
mH₂O
|
0.686466
bar
|
8
mH₂O
|
0.784532
bar
|
9
mH₂O
|
0.882599
bar
|
10
mH₂O
|
0.980665
bar
|
11
mH₂O
|
1.07873
bar
|
12
mH₂O
|
1.1768
bar
|
13
mH₂O
|
1.27486
bar
|
14
mH₂O
|
1.37293
bar
|
15
mH₂O
|
1.471
bar
|
16
mH₂O
|
1.56906
bar
|
17
mH₂O
|
1.66713
bar
|
18
mH₂O
|
1.7652
bar
|
19
mH₂O
|
1.86326
bar
|
20
mH₂O
|
1.96133
bar
|
21
mH₂O
|
2.0594
bar
|
22
mH₂O
|
2.15746
bar
|
23
mH₂O
|
2.25553
bar
|
24
mH₂O
|
2.3536
bar
|
25
mH₂O
|
2.45166
bar
|
26
mH₂O
|
2.54973
bar
|
27
mH₂O
|
2.6478
bar
|
28
mH₂O
|
2.74586
bar
|
29
mH₂O
|
2.84393
bar
|
30
mH₂O
|
2.942
bar
|
31
mH₂O
|
3.04006
bar
|
32
mH₂O
|
3.13813
bar
|
33
mH₂O
|
3.23619
bar
|
34
mH₂O
|
3.33426
bar
|
35
mH₂O
|
3.43233
bar
|
36
mH₂O
|
3.53039
bar
|
37
mH₂O
|
3.62846
bar
|
38
mH₂O
|
3.72653
bar
|
39
mH₂O
|
3.82459
bar
|
40
mH₂O
|
3.92266
bar
|
41
mH₂O
|
4.02073
bar
|
42
mH₂O
|
4.11879
bar
|
43
mH₂O
|
4.21686
bar
|
44
mH₂O
|
4.31493
bar
|
45
mH₂O
|
4.41299
bar
|
46
mH₂O
|
4.51106
bar
|
47
mH₂O
|
4.60913
bar
|
48
mH₂O
|
4.70719
bar
|
49
mH₂O
|
4.80526
bar
|
50
mH₂O
|
4.90333
bar
|
51
mH₂O
|
5.00139
bar
|
52
mH₂O
|
5.09946
bar
|
53
mH₂O
|
5.19752
bar
|
54
mH₂O
|
5.29559
bar
|
55
mH₂O
|
5.39366
bar
|
56
mH₂O
|
5.49172
bar
|
57
mH₂O
|
5.58979
bar
|
58
mH₂O
|
5.68786
bar
|
59
mH₂O
|
5.78592
bar
|
60
mH₂O
|
5.88399
bar
|
61
mH₂O
|
5.98206
bar
|
62
mH₂O
|
6.08012
bar
|
63
mH₂O
|
6.17819
bar
|
64
mH₂O
|
6.27626
bar
|
65
mH₂O
|
6.37432
bar
|
66
mH₂O
|
6.47239
bar
|
67
mH₂O
|
6.57046
bar
|
68
mH₂O
|
6.66852
bar
|
69
mH₂O
|
6.76659
bar
|
70
mH₂O
|
6.86466
bar
|
71
mH₂O
|
6.96272
bar
|
72
mH₂O
|
7.06079
bar
|
73
mH₂O
|
7.15885
bar
|
74
mH₂O
|
7.25692
bar
|
75
mH₂O
|
7.35499
bar
|
76
mH₂O
|
7.45305
bar
|
77
mH₂O
|
7.55112
bar
|
78
mH₂O
|
7.64919
bar
|
79
mH₂O
|
7.74725
bar
|
80
mH₂O
|
7.84532
bar
|
81
mH₂O
|
7.94339
bar
|
82
mH₂O
|
8.04145
bar
|
83
mH₂O
|
8.13952
bar
|
84
mH₂O
|
8.23759
bar
|
85
mH₂O
|
8.33565
bar
|
86
mH₂O
|
8.43372
bar
|
87
mH₂O
|
8.53179
bar
|
88
mH₂O
|
8.62985
bar
|
89
mH₂O
|
8.72792
bar
|
90
mH₂O
|
8.82599
bar
|
91
mH₂O
|
8.92405
bar
|
92
mH₂O
|
9.02212
bar
|
93
mH₂O
|
9.12018
bar
|
94
mH₂O
|
9.21825
bar
|
95
mH₂O
|
9.31632
bar
|
96
mH₂O
|
9.41438
bar
|
97
mH₂O
|
9.51245
bar
|
98
mH₂O
|
9.61052
bar
|
99
mH₂O
|
9.70858
bar
|
100
mH₂O
|
9.80665
bar
|
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