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.
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.
Torr | Millibar |
---|---|
0
torr
|
0
mbar
|
10
torr
|
13.33224
mbar
|
20
torr
|
26.66447
mbar
|
30
torr
|
39.99671
mbar
|
40
torr
|
53.32895
mbar
|
50
torr
|
66.66118
mbar
|
60
torr
|
79.99342
mbar
|
70
torr
|
93.32566
mbar
|
80
torr
|
106.65789
mbar
|
90
torr
|
119.99013
mbar
|
100
torr
|
133.32237
mbar
|
110
torr
|
146.65461
mbar
|
120
torr
|
159.98684
mbar
|
130
torr
|
173.31908
mbar
|
140
torr
|
186.65132
mbar
|
150
torr
|
199.98355
mbar
|
160
torr
|
213.31579
mbar
|
170
torr
|
226.64803
mbar
|
180
torr
|
239.98026
mbar
|
190
torr
|
253.3125
mbar
|
200
torr
|
266.64474
mbar
|
210
torr
|
279.97697
mbar
|
220
torr
|
293.30921
mbar
|
230
torr
|
306.64145
mbar
|
240
torr
|
319.97368
mbar
|
250
torr
|
333.30592
mbar
|
260
torr
|
346.63816
mbar
|
270
torr
|
359.97039
mbar
|
280
torr
|
373.30263
mbar
|
290
torr
|
386.63487
mbar
|
300
torr
|
399.96711
mbar
|
310
torr
|
413.29934
mbar
|
320
torr
|
426.63158
mbar
|
330
torr
|
439.96382
mbar
|
340
torr
|
453.29605
mbar
|
350
torr
|
466.62829
mbar
|
360
torr
|
479.96053
mbar
|
370
torr
|
493.29276
mbar
|
380
torr
|
506.625
mbar
|
390
torr
|
519.95724
mbar
|
400
torr
|
533.28947
mbar
|
410
torr
|
546.62171
mbar
|
420
torr
|
559.95395
mbar
|
430
torr
|
573.28618
mbar
|
440
torr
|
586.61842
mbar
|
450
torr
|
599.95066
mbar
|
460
torr
|
613.28289
mbar
|
470
torr
|
626.61513
mbar
|
480
torr
|
639.94737
mbar
|
490
torr
|
653.27961
mbar
|
500
torr
|
666.61184
mbar
|
510
torr
|
679.94408
mbar
|
520
torr
|
693.27632
mbar
|
530
torr
|
706.60855
mbar
|
540
torr
|
719.94079
mbar
|
550
torr
|
733.27303
mbar
|
560
torr
|
746.60526
mbar
|
570
torr
|
759.9375
mbar
|
580
torr
|
773.26974
mbar
|
590
torr
|
786.60197
mbar
|
600
torr
|
799.93421
mbar
|
610
torr
|
813.26645
mbar
|
620
torr
|
826.59868
mbar
|
630
torr
|
839.93092
mbar
|
640
torr
|
853.26316
mbar
|
650
torr
|
866.59539
mbar
|
660
torr
|
879.92763
mbar
|
670
torr
|
893.25987
mbar
|
680
torr
|
906.59211
mbar
|
690
torr
|
919.92434
mbar
|
700
torr
|
933.25658
mbar
|
710
torr
|
946.58882
mbar
|
720
torr
|
959.92105
mbar
|
730
torr
|
973.25329
mbar
|
740
torr
|
986.58553
mbar
|
750
torr
|
999.91776
mbar
|
760
torr
|
1013.25
mbar
|
770
torr
|
1026.58224
mbar
|
780
torr
|
1039.91447
mbar
|
790
torr
|
1053.24671
mbar
|
800
torr
|
1066.57895
mbar
|
810
torr
|
1079.91118
mbar
|
820
torr
|
1093.24342
mbar
|
830
torr
|
1106.57566
mbar
|
840
torr
|
1119.90789
mbar
|
850
torr
|
1133.24013
mbar
|
860
torr
|
1146.57237
mbar
|
870
torr
|
1159.90461
mbar
|
880
torr
|
1173.23684
mbar
|
890
torr
|
1186.56908
mbar
|
900
torr
|
1199.90132
mbar
|
910
torr
|
1213.23355
mbar
|
920
torr
|
1226.56579
mbar
|
930
torr
|
1239.89803
mbar
|
940
torr
|
1253.23026
mbar
|
950
torr
|
1266.5625
mbar
|
960
torr
|
1279.89474
mbar
|
970
torr
|
1293.22697
mbar
|
980
torr
|
1306.55921
mbar
|
990
torr
|
1319.89145
mbar
|
1000
torr
|
1333.22368
mbar
|
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