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.
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.
Kilopound per square inch | Meters of water @ 4°C |
---|---|
0
ksi
|
0
mH₂O
|
0.1
ksi
|
70.30699
mH₂O
|
0.2
ksi
|
140.61397
mH₂O
|
0.3
ksi
|
210.92096
mH₂O
|
0.4
ksi
|
281.22794
mH₂O
|
0.5
ksi
|
351.53493
mH₂O
|
0.6
ksi
|
421.84191
mH₂O
|
0.7
ksi
|
492.1489
mH₂O
|
0.8
ksi
|
562.45588
mH₂O
|
0.9
ksi
|
632.76287
mH₂O
|
1
ksi
|
703.06986
mH₂O
|
1.1
ksi
|
773.37684
mH₂O
|
1.2
ksi
|
843.68383
mH₂O
|
1.3
ksi
|
913.99081
mH₂O
|
1.4
ksi
|
984.2978
mH₂O
|
1.5
ksi
|
1054.60478
mH₂O
|
1.6
ksi
|
1124.91177
mH₂O
|
1.7
ksi
|
1195.21875
mH₂O
|
1.8
ksi
|
1265.52574
mH₂O
|
1.9
ksi
|
1335.83273
mH₂O
|
2
ksi
|
1406.13971
mH₂O
|
2.1
ksi
|
1476.4467
mH₂O
|
2.2
ksi
|
1546.75368
mH₂O
|
2.3
ksi
|
1617.06067
mH₂O
|
2.4
ksi
|
1687.36765
mH₂O
|
2.5
ksi
|
1757.67464
mH₂O
|
2.6
ksi
|
1827.98162
mH₂O
|
2.7
ksi
|
1898.28861
mH₂O
|
2.8
ksi
|
1968.5956
mH₂O
|
2.9
ksi
|
2038.90258
mH₂O
|
3
ksi
|
2109.20957
mH₂O
|
3.1
ksi
|
2179.51655
mH₂O
|
3.2
ksi
|
2249.82354
mH₂O
|
3.3
ksi
|
2320.13052
mH₂O
|
3.4
ksi
|
2390.43751
mH₂O
|
3.5
ksi
|
2460.74449
mH₂O
|
3.6
ksi
|
2531.05148
mH₂O
|
3.7
ksi
|
2601.35847
mH₂O
|
3.8
ksi
|
2671.66545
mH₂O
|
3.9
ksi
|
2741.97244
mH₂O
|
4
ksi
|
2812.27942
mH₂O
|
4.1
ksi
|
2882.58641
mH₂O
|
4.2
ksi
|
2952.89339
mH₂O
|
4.3
ksi
|
3023.20038
mH₂O
|
4.4
ksi
|
3093.50737
mH₂O
|
4.5
ksi
|
3163.81435
mH₂O
|
4.6
ksi
|
3234.12134
mH₂O
|
4.7
ksi
|
3304.42832
mH₂O
|
4.8
ksi
|
3374.73531
mH₂O
|
4.9
ksi
|
3445.04229
mH₂O
|
5
ksi
|
3515.34928
mH₂O
|
5.1
ksi
|
3585.65626
mH₂O
|
5.2
ksi
|
3655.96325
mH₂O
|
5.3
ksi
|
3726.27024
mH₂O
|
5.4
ksi
|
3796.57722
mH₂O
|
5.5
ksi
|
3866.88421
mH₂O
|
5.6
ksi
|
3937.19119
mH₂O
|
5.7
ksi
|
4007.49818
mH₂O
|
5.8
ksi
|
4077.80516
mH₂O
|
5.9
ksi
|
4148.11215
mH₂O
|
6
ksi
|
4218.41913
mH₂O
|
6.1
ksi
|
4288.72612
mH₂O
|
6.2
ksi
|
4359.03311
mH₂O
|
6.3
ksi
|
4429.34009
mH₂O
|
6.4
ksi
|
4499.64708
mH₂O
|
6.5
ksi
|
4569.95406
mH₂O
|
6.6
ksi
|
4640.26105
mH₂O
|
6.7
ksi
|
4710.56803
mH₂O
|
6.8
ksi
|
4780.87502
mH₂O
|
6.9
ksi
|
4851.182
mH₂O
|
7
ksi
|
4921.48899
mH₂O
|
7.1
ksi
|
4991.79598
mH₂O
|
7.2
ksi
|
5062.10296
mH₂O
|
7.3
ksi
|
5132.40995
mH₂O
|
7.4
ksi
|
5202.71693
mH₂O
|
7.5
ksi
|
5273.02392
mH₂O
|
7.6
ksi
|
5343.3309
mH₂O
|
7.7
ksi
|
5413.63789
mH₂O
|
7.8
ksi
|
5483.94487
mH₂O
|
7.9
ksi
|
5554.25186
mH₂O
|
8
ksi
|
5624.55885
mH₂O
|
8.1
ksi
|
5694.86583
mH₂O
|
8.2
ksi
|
5765.17282
mH₂O
|
8.3
ksi
|
5835.4798
mH₂O
|
8.4
ksi
|
5905.78679
mH₂O
|
8.5
ksi
|
5976.09377
mH₂O
|
8.6
ksi
|
6046.40076
mH₂O
|
8.7
ksi
|
6116.70774
mH₂O
|
8.8
ksi
|
6187.01473
mH₂O
|
8.9
ksi
|
6257.32172
mH₂O
|
9
ksi
|
6327.6287
mH₂O
|
9.1
ksi
|
6397.93569
mH₂O
|
9.2
ksi
|
6468.24267
mH₂O
|
9.3
ksi
|
6538.54966
mH₂O
|
9.4
ksi
|
6608.85664
mH₂O
|
9.5
ksi
|
6679.16363
mH₂O
|
9.6
ksi
|
6749.47061
mH₂O
|
9.7
ksi
|
6819.7776
mH₂O
|
9.8
ksi
|
6890.08459
mH₂O
|
9.9
ksi
|
6960.39157
mH₂O
|
10
ksi
|
7030.69856
mH₂O
|
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