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.
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.
Millibar | Meters of water @ 4°C |
---|---|
0
mbar
|
0
mH₂O
|
10
mbar
|
0.101972
mH₂O
|
20
mbar
|
0.203943
mH₂O
|
30
mbar
|
0.305915
mH₂O
|
40
mbar
|
0.407886
mH₂O
|
50
mbar
|
0.509858
mH₂O
|
60
mbar
|
0.61183
mH₂O
|
70
mbar
|
0.713801
mH₂O
|
80
mbar
|
0.815773
mH₂O
|
90
mbar
|
0.917745
mH₂O
|
100
mbar
|
1.01972
mH₂O
|
110
mbar
|
1.12169
mH₂O
|
120
mbar
|
1.22366
mH₂O
|
130
mbar
|
1.32563
mH₂O
|
140
mbar
|
1.4276
mH₂O
|
150
mbar
|
1.52957
mH₂O
|
160
mbar
|
1.63155
mH₂O
|
170
mbar
|
1.73352
mH₂O
|
180
mbar
|
1.83549
mH₂O
|
190
mbar
|
1.93746
mH₂O
|
200
mbar
|
2.03943
mH₂O
|
210
mbar
|
2.1414
mH₂O
|
220
mbar
|
2.24338
mH₂O
|
230
mbar
|
2.34535
mH₂O
|
240
mbar
|
2.44732
mH₂O
|
250
mbar
|
2.54929
mH₂O
|
260
mbar
|
2.65126
mH₂O
|
270
mbar
|
2.75323
mH₂O
|
280
mbar
|
2.85521
mH₂O
|
290
mbar
|
2.95718
mH₂O
|
300
mbar
|
3.05915
mH₂O
|
310
mbar
|
3.16112
mH₂O
|
320
mbar
|
3.26309
mH₂O
|
330
mbar
|
3.36506
mH₂O
|
340
mbar
|
3.46704
mH₂O
|
350
mbar
|
3.56901
mH₂O
|
360
mbar
|
3.67098
mH₂O
|
370
mbar
|
3.77295
mH₂O
|
380
mbar
|
3.87492
mH₂O
|
390
mbar
|
3.97689
mH₂O
|
400
mbar
|
4.07886
mH₂O
|
410
mbar
|
4.18084
mH₂O
|
420
mbar
|
4.28281
mH₂O
|
430
mbar
|
4.38478
mH₂O
|
440
mbar
|
4.48675
mH₂O
|
450
mbar
|
4.58872
mH₂O
|
460
mbar
|
4.69069
mH₂O
|
470
mbar
|
4.79267
mH₂O
|
480
mbar
|
4.89464
mH₂O
|
490
mbar
|
4.99661
mH₂O
|
500
mbar
|
5.09858
mH₂O
|
510
mbar
|
5.20055
mH₂O
|
520
mbar
|
5.30252
mH₂O
|
530
mbar
|
5.4045
mH₂O
|
540
mbar
|
5.50647
mH₂O
|
550
mbar
|
5.60844
mH₂O
|
560
mbar
|
5.71041
mH₂O
|
570
mbar
|
5.81238
mH₂O
|
580
mbar
|
5.91435
mH₂O
|
590
mbar
|
6.01633
mH₂O
|
600
mbar
|
6.1183
mH₂O
|
610
mbar
|
6.22027
mH₂O
|
620
mbar
|
6.32224
mH₂O
|
630
mbar
|
6.42421
mH₂O
|
640
mbar
|
6.52618
mH₂O
|
650
mbar
|
6.62816
mH₂O
|
660
mbar
|
6.73013
mH₂O
|
670
mbar
|
6.8321
mH₂O
|
680
mbar
|
6.93407
mH₂O
|
690
mbar
|
7.03604
mH₂O
|
700
mbar
|
7.13801
mH₂O
|
710
mbar
|
7.23999
mH₂O
|
720
mbar
|
7.34196
mH₂O
|
730
mbar
|
7.44393
mH₂O
|
740
mbar
|
7.5459
mH₂O
|
750
mbar
|
7.64787
mH₂O
|
760
mbar
|
7.74984
mH₂O
|
770
mbar
|
7.85181
mH₂O
|
780
mbar
|
7.95379
mH₂O
|
790
mbar
|
8.05576
mH₂O
|
800
mbar
|
8.15773
mH₂O
|
810
mbar
|
8.2597
mH₂O
|
820
mbar
|
8.36167
mH₂O
|
830
mbar
|
8.46364
mH₂O
|
840
mbar
|
8.56562
mH₂O
|
850
mbar
|
8.66759
mH₂O
|
860
mbar
|
8.76956
mH₂O
|
870
mbar
|
8.87153
mH₂O
|
880
mbar
|
8.9735
mH₂O
|
890
mbar
|
9.07547
mH₂O
|
900
mbar
|
9.17745
mH₂O
|
910
mbar
|
9.27942
mH₂O
|
920
mbar
|
9.38139
mH₂O
|
930
mbar
|
9.48336
mH₂O
|
940
mbar
|
9.58533
mH₂O
|
950
mbar
|
9.6873
mH₂O
|
960
mbar
|
9.78928
mH₂O
|
970
mbar
|
9.89125
mH₂O
|
980
mbar
|
9.99322
mH₂O
|
990
mbar
|
10.09519
mH₂O
|
1000
mbar
|
10.19716
mH₂O
|
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