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 (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.
Torr | Pounds per square inch |
---|---|
0
torr
|
0
psi
|
10
torr
|
0.193368
psi
|
20
torr
|
0.386735
psi
|
30
torr
|
0.580103
psi
|
40
torr
|
0.773471
psi
|
50
torr
|
0.966838
psi
|
60
torr
|
1.16021
psi
|
70
torr
|
1.35357
psi
|
80
torr
|
1.54694
psi
|
90
torr
|
1.74031
psi
|
100
torr
|
1.93368
psi
|
110
torr
|
2.12704
psi
|
120
torr
|
2.32041
psi
|
130
torr
|
2.51378
psi
|
140
torr
|
2.70715
psi
|
150
torr
|
2.90052
psi
|
160
torr
|
3.09388
psi
|
170
torr
|
3.28725
psi
|
180
torr
|
3.48062
psi
|
190
torr
|
3.67399
psi
|
200
torr
|
3.86735
psi
|
210
torr
|
4.06072
psi
|
220
torr
|
4.25409
psi
|
230
torr
|
4.44746
psi
|
240
torr
|
4.64082
psi
|
250
torr
|
4.83419
psi
|
260
torr
|
5.02756
psi
|
270
torr
|
5.22093
psi
|
280
torr
|
5.41429
psi
|
290
torr
|
5.60766
psi
|
300
torr
|
5.80103
psi
|
310
torr
|
5.9944
psi
|
320
torr
|
6.18777
psi
|
330
torr
|
6.38113
psi
|
340
torr
|
6.5745
psi
|
350
torr
|
6.76787
psi
|
360
torr
|
6.96124
psi
|
370
torr
|
7.1546
psi
|
380
torr
|
7.34797
psi
|
390
torr
|
7.54134
psi
|
400
torr
|
7.73471
psi
|
410
torr
|
7.92807
psi
|
420
torr
|
8.12144
psi
|
430
torr
|
8.31481
psi
|
440
torr
|
8.50818
psi
|
450
torr
|
8.70155
psi
|
460
torr
|
8.89491
psi
|
470
torr
|
9.08828
psi
|
480
torr
|
9.28165
psi
|
490
torr
|
9.47502
psi
|
500
torr
|
9.66838
psi
|
510
torr
|
9.86175
psi
|
520
torr
|
10.05512
psi
|
530
torr
|
10.24849
psi
|
540
torr
|
10.44185
psi
|
550
torr
|
10.63522
psi
|
560
torr
|
10.82859
psi
|
570
torr
|
11.02196
psi
|
580
torr
|
11.21532
psi
|
590
torr
|
11.40869
psi
|
600
torr
|
11.60206
psi
|
610
torr
|
11.79543
psi
|
620
torr
|
11.9888
psi
|
630
torr
|
12.18216
psi
|
640
torr
|
12.37553
psi
|
650
torr
|
12.5689
psi
|
660
torr
|
12.76227
psi
|
670
torr
|
12.95563
psi
|
680
torr
|
13.149
psi
|
690
torr
|
13.34237
psi
|
700
torr
|
13.53574
psi
|
710
torr
|
13.7291
psi
|
720
torr
|
13.92247
psi
|
730
torr
|
14.11584
psi
|
740
torr
|
14.30921
psi
|
750
torr
|
14.50258
psi
|
760
torr
|
14.69594
psi
|
770
torr
|
14.88931
psi
|
780
torr
|
15.08268
psi
|
790
torr
|
15.27605
psi
|
800
torr
|
15.46941
psi
|
810
torr
|
15.66278
psi
|
820
torr
|
15.85615
psi
|
830
torr
|
16.04952
psi
|
840
torr
|
16.24288
psi
|
850
torr
|
16.43625
psi
|
860
torr
|
16.62962
psi
|
870
torr
|
16.82299
psi
|
880
torr
|
17.01636
psi
|
890
torr
|
17.20972
psi
|
900
torr
|
17.40309
psi
|
910
torr
|
17.59646
psi
|
920
torr
|
17.78983
psi
|
930
torr
|
17.98319
psi
|
940
torr
|
18.17656
psi
|
950
torr
|
18.36993
psi
|
960
torr
|
18.5633
psi
|
970
torr
|
18.75666
psi
|
980
torr
|
18.95003
psi
|
990
torr
|
19.1434
psi
|
1000
torr
|
19.33677
psi
|
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