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.
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.
Millibar | Kilopound per square inch |
---|---|
0
mbar
|
0
ksi
|
10
mbar
|
0.000145038
ksi
|
20
mbar
|
0.000290075
ksi
|
30
mbar
|
0.000435113
ksi
|
40
mbar
|
0.000580151
ksi
|
50
mbar
|
0.000725188
ksi
|
60
mbar
|
0.000870226
ksi
|
70
mbar
|
0.00101526
ksi
|
80
mbar
|
0.0011603
ksi
|
90
mbar
|
0.00130534
ksi
|
100
mbar
|
0.00145038
ksi
|
110
mbar
|
0.00159541
ksi
|
120
mbar
|
0.00174045
ksi
|
130
mbar
|
0.00188549
ksi
|
140
mbar
|
0.00203053
ksi
|
150
mbar
|
0.00217557
ksi
|
160
mbar
|
0.0023206
ksi
|
170
mbar
|
0.00246564
ksi
|
180
mbar
|
0.00261068
ksi
|
190
mbar
|
0.00275572
ksi
|
200
mbar
|
0.00290075
ksi
|
210
mbar
|
0.00304579
ksi
|
220
mbar
|
0.00319083
ksi
|
230
mbar
|
0.00333587
ksi
|
240
mbar
|
0.0034809
ksi
|
250
mbar
|
0.00362594
ksi
|
260
mbar
|
0.00377098
ksi
|
270
mbar
|
0.00391602
ksi
|
280
mbar
|
0.00406106
ksi
|
290
mbar
|
0.00420609
ksi
|
300
mbar
|
0.00435113
ksi
|
310
mbar
|
0.00449617
ksi
|
320
mbar
|
0.00464121
ksi
|
330
mbar
|
0.00478624
ksi
|
340
mbar
|
0.00493128
ksi
|
350
mbar
|
0.00507632
ksi
|
360
mbar
|
0.00522136
ksi
|
370
mbar
|
0.00536639
ksi
|
380
mbar
|
0.00551143
ksi
|
390
mbar
|
0.00565647
ksi
|
400
mbar
|
0.00580151
ksi
|
410
mbar
|
0.00594654
ksi
|
420
mbar
|
0.00609158
ksi
|
430
mbar
|
0.00623662
ksi
|
440
mbar
|
0.00638166
ksi
|
450
mbar
|
0.0065267
ksi
|
460
mbar
|
0.00667173
ksi
|
470
mbar
|
0.00681677
ksi
|
480
mbar
|
0.00696181
ksi
|
490
mbar
|
0.00710685
ksi
|
500
mbar
|
0.00725188
ksi
|
510
mbar
|
0.00739692
ksi
|
520
mbar
|
0.00754196
ksi
|
530
mbar
|
0.007687
ksi
|
540
mbar
|
0.00783203
ksi
|
550
mbar
|
0.00797707
ksi
|
560
mbar
|
0.00812211
ksi
|
570
mbar
|
0.00826715
ksi
|
580
mbar
|
0.00841219
ksi
|
590
mbar
|
0.00855722
ksi
|
600
mbar
|
0.00870226
ksi
|
610
mbar
|
0.0088473
ksi
|
620
mbar
|
0.00899234
ksi
|
630
mbar
|
0.00913737
ksi
|
640
mbar
|
0.00928241
ksi
|
650
mbar
|
0.00942745
ksi
|
660
mbar
|
0.00957249
ksi
|
670
mbar
|
0.00971752
ksi
|
680
mbar
|
0.00986256
ksi
|
690
mbar
|
0.0100076
ksi
|
700
mbar
|
0.0101526
ksi
|
710
mbar
|
0.0102977
ksi
|
720
mbar
|
0.0104427
ksi
|
730
mbar
|
0.0105878
ksi
|
740
mbar
|
0.0107328
ksi
|
750
mbar
|
0.0108778
ksi
|
760
mbar
|
0.0110229
ksi
|
770
mbar
|
0.0111679
ksi
|
780
mbar
|
0.0113129
ksi
|
790
mbar
|
0.011458
ksi
|
800
mbar
|
0.011603
ksi
|
810
mbar
|
0.0117481
ksi
|
820
mbar
|
0.0118931
ksi
|
830
mbar
|
0.0120381
ksi
|
840
mbar
|
0.0121832
ksi
|
850
mbar
|
0.0123282
ksi
|
860
mbar
|
0.0124732
ksi
|
870
mbar
|
0.0126183
ksi
|
880
mbar
|
0.0127633
ksi
|
890
mbar
|
0.0129084
ksi
|
900
mbar
|
0.0130534
ksi
|
910
mbar
|
0.0131984
ksi
|
920
mbar
|
0.0133435
ksi
|
930
mbar
|
0.0134885
ksi
|
940
mbar
|
0.0136335
ksi
|
950
mbar
|
0.0137786
ksi
|
960
mbar
|
0.0139236
ksi
|
970
mbar
|
0.0140687
ksi
|
980
mbar
|
0.0142137
ksi
|
990
mbar
|
0.0143587
ksi
|
1000
mbar
|
0.0145038
ksi
|
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