Pounds per square inch (psi) is a crucial unit of pressure measurement, widely used across various industries, including automotive, aviation, and even space exploration. One interesting fact is that a typical car tire is inflated to around 30 psi, but did you know that a commercial jetliner’s cabin is pressurized to a reduced level of 11 psi to simulate being at a comfortable altitude of about 6,000-8,000 feet? This helps passengers avoid the stress of low oxygen levels while flying at over 35,000 feet, where the atmospheric pressure is a meager 4 psi.
Moreover, psi is pivotal in assessing the force exerted on surfaces. If you’ve ever wondered why deep-sea submarines have thick hulls, it’s because they must withstand pressures of around 8,800 psi at depths of 6 miles beneath the ocean’s surface! This ensures safe exploration of the mysterious deep-sea world, showcasing psi’s significance in enabling human feats in extreme environments.
The torr is a unit of pressure named after the Italian physicist Evangelista Torricelli, who invented the barometer in the 17th century. It is defined as 1/760th of an atmosphere, approximating the pressure exerted by a one-millimeter column of mercury at 0 degrees Celsius. What makes the torr particularly interesting is its practical use in fields like vacuum technology and weather forecasting, where precise measurements of atmospheric pressure are crucial.
The legacy of Torricelli’s work is integral to meteorology and physics, as it opened paths for understanding atmospheric pressure. Beyond scientific circles, the torr is a reminder of human ingenuity in unraveling atmospheric mysteries and continues to play a vital role in today’s scientific advancements.
Pounds per square inch | Torr |
---|---|
0
psi
|
0
torr
|
10
psi
|
517.14953
torr
|
20
psi
|
1034.29906
torr
|
30
psi
|
1551.44859
torr
|
40
psi
|
2068.59812
torr
|
50
psi
|
2585.74764
torr
|
60
psi
|
3102.89717
torr
|
70
psi
|
3620.0467
torr
|
80
psi
|
4137.19623
torr
|
90
psi
|
4654.34576
torr
|
100
psi
|
5171.49529
torr
|
110
psi
|
5688.64482
torr
|
120
psi
|
6205.79435
torr
|
130
psi
|
6722.94387
torr
|
140
psi
|
7240.0934
torr
|
150
psi
|
7757.24293
torr
|
160
psi
|
8274.39246
torr
|
170
psi
|
8791.54199
torr
|
180
psi
|
9308.69152
torr
|
190
psi
|
9825.84105
torr
|
200
psi
|
10342.99058
torr
|
210
psi
|
10860.1401
torr
|
220
psi
|
11377.28963
torr
|
230
psi
|
11894.43916
torr
|
240
psi
|
12411.58869
torr
|
250
psi
|
12928.73822
torr
|
260
psi
|
13445.88775
torr
|
270
psi
|
13963.03728
torr
|
280
psi
|
14480.18681
torr
|
290
psi
|
14997.33633
torr
|
300
psi
|
15514.48586
torr
|
310
psi
|
16031.63539
torr
|
320
psi
|
16548.78492
torr
|
330
psi
|
17065.93445
torr
|
340
psi
|
17583.08398
torr
|
350
psi
|
18100.23351
torr
|
360
psi
|
18617.38304
torr
|
370
psi
|
19134.53256
torr
|
380
psi
|
19651.68209
torr
|
390
psi
|
20168.83162
torr
|
400
psi
|
20685.98115
torr
|
410
psi
|
21203.13068
torr
|
420
psi
|
21720.28021
torr
|
430
psi
|
22237.42974
torr
|
440
psi
|
22754.57927
torr
|
450
psi
|
23271.7288
torr
|
460
psi
|
23788.87832
torr
|
470
psi
|
24306.02785
torr
|
480
psi
|
24823.17738
torr
|
490
psi
|
25340.32691
torr
|
500
psi
|
25857.47644
torr
|
510
psi
|
26374.62597
torr
|
520
psi
|
26891.7755
torr
|
530
psi
|
27408.92503
torr
|
540
psi
|
27926.07455
torr
|
550
psi
|
28443.22408
torr
|
560
psi
|
28960.37361
torr
|
570
psi
|
29477.52314
torr
|
580
psi
|
29994.67267
torr
|
590
psi
|
30511.8222
torr
|
600
psi
|
31028.97173
torr
|
610
psi
|
31546.12126
torr
|
620
psi
|
32063.27078
torr
|
630
psi
|
32580.42031
torr
|
640
psi
|
33097.56984
torr
|
650
psi
|
33614.71937
torr
|
660
psi
|
34131.8689
torr
|
670
psi
|
34649.01843
torr
|
680
psi
|
35166.16796
torr
|
690
psi
|
35683.31749
torr
|
700
psi
|
36200.46701
torr
|
710
psi
|
36717.61654
torr
|
720
psi
|
37234.76607
torr
|
730
psi
|
37751.9156
torr
|
740
psi
|
38269.06513
torr
|
750
psi
|
38786.21466
torr
|
760
psi
|
39303.36419
torr
|
770
psi
|
39820.51372
torr
|
780
psi
|
40337.66324
torr
|
790
psi
|
40854.81277
torr
|
800
psi
|
41371.9623
torr
|
810
psi
|
41889.11183
torr
|
820
psi
|
42406.26136
torr
|
830
psi
|
42923.41089
torr
|
840
psi
|
43440.56042
torr
|
850
psi
|
43957.70995
torr
|
860
psi
|
44474.85947
torr
|
870
psi
|
44992.009
torr
|
880
psi
|
45509.15853
torr
|
890
psi
|
46026.30806
torr
|
900
psi
|
46543.45759
torr
|
910
psi
|
47060.60712
torr
|
920
psi
|
47577.75665
torr
|
930
psi
|
48094.90618
torr
|
940
psi
|
48612.05571
torr
|
950
psi
|
49129.20523
torr
|
960
psi
|
49646.35476
torr
|
970
psi
|
50163.50429
torr
|
980
psi
|
50680.65382
torr
|
990
psi
|
51197.80335
torr
|
1000
psi
|
51714.95288
torr
|
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