Foot per minute (ft/min) is a fascinating unit of speed often used in specialized fields such as HVAC (heating, ventilation, and air conditioning) systems to measure airflow and in other engineering applications. Interestingly, the roots of this unit can be traced back to the historical origins of the foot as a measurement, which dates back to ancient Egypt where the “royal foot” was utilized. Over centuries, various civilizations have adopted and adapted the foot, leading to the version we use today.
While it might seem esoteric, ft/min is crucial for ensuring precise calibrations and ensuring optimal efficiency in engineering contexts. For example, it is heavily relied upon to ensure the right amount of air changes per hour in room ventilation, directly affecting air quality and energy efficiency. Understanding and utilizing this unit connects us to a broader narrative of measurement evolution and technical precision.
The mile per hour, commonly abbreviated as mph, is a unit of speed originating from the British imperial system and widely used in the United States and the United Kingdom. It’s fascinating to know that the concept of mph has historical significance dating back to the invention of the first automobiles in the late 19th century. The iconic cars of the 1920s, often called “classic cars,” were among the first to publicly advertise their capabilities in mph, including models like the Ford Model T, which had a top speed of about 45 mph.
Interestingly, mph is still the primary speed measurement unit for most road signage in countries such as the US and the UK, even while the rest of the world predominantly uses kilometers per hour (kph). The land-speed record attempts, including those made with the supersonic car “ThrustSSC,” which achieved an astonishing 763 mph in 1997, also emphasize the significance of this unit in measuring extreme speeds.
Feet per minute | Miles per hour |
---|---|
0
ft/min
|
0
mph
|
10
ft/min
|
0.113636
mph
|
20
ft/min
|
0.227272
mph
|
30
ft/min
|
0.340908
mph
|
40
ft/min
|
0.454544
mph
|
50
ft/min
|
0.56818
mph
|
60
ft/min
|
0.681816
mph
|
70
ft/min
|
0.795452
mph
|
80
ft/min
|
0.909088
mph
|
90
ft/min
|
1.02272
mph
|
100
ft/min
|
1.13636
mph
|
110
ft/min
|
1.25
mph
|
120
ft/min
|
1.36363
mph
|
130
ft/min
|
1.47727
mph
|
140
ft/min
|
1.5909
mph
|
150
ft/min
|
1.70454
mph
|
160
ft/min
|
1.81818
mph
|
170
ft/min
|
1.93181
mph
|
180
ft/min
|
2.04545
mph
|
190
ft/min
|
2.15908
mph
|
200
ft/min
|
2.27272
mph
|
210
ft/min
|
2.38636
mph
|
220
ft/min
|
2.5
mph
|
230
ft/min
|
2.61363
mph
|
240
ft/min
|
2.72726
mph
|
250
ft/min
|
2.8409
mph
|
260
ft/min
|
2.95454
mph
|
270
ft/min
|
3.06817
mph
|
280
ft/min
|
3.18181
mph
|
290
ft/min
|
3.29544
mph
|
300
ft/min
|
3.40908
mph
|
310
ft/min
|
3.52272
mph
|
320
ft/min
|
3.63635
mph
|
330
ft/min
|
3.74999
mph
|
340
ft/min
|
3.86362
mph
|
350
ft/min
|
3.97726
mph
|
360
ft/min
|
4.0909
mph
|
370
ft/min
|
4.20453
mph
|
380
ft/min
|
4.31817
mph
|
390
ft/min
|
4.4318
mph
|
400
ft/min
|
4.54544
mph
|
410
ft/min
|
4.65908
mph
|
420
ft/min
|
4.77271
mph
|
430
ft/min
|
4.88635
mph
|
440
ft/min
|
5
mph
|
450
ft/min
|
5.11362
mph
|
460
ft/min
|
5.22726
mph
|
470
ft/min
|
5.34089
mph
|
480
ft/min
|
5.45453
mph
|
490
ft/min
|
5.56816
mph
|
500
ft/min
|
5.6818
mph
|
510
ft/min
|
5.79544
mph
|
520
ft/min
|
5.90907
mph
|
530
ft/min
|
6.02271
mph
|
540
ft/min
|
6.13634
mph
|
550
ft/min
|
6.24998
mph
|
560
ft/min
|
6.36362
mph
|
570
ft/min
|
6.47725
mph
|
580
ft/min
|
6.59089
mph
|
590
ft/min
|
6.70452
mph
|
600
ft/min
|
6.81816
mph
|
610
ft/min
|
6.9318
mph
|
620
ft/min
|
7.04543
mph
|
630
ft/min
|
7.15907
mph
|
640
ft/min
|
7.2727
mph
|
650
ft/min
|
7.38634
mph
|
660
ft/min
|
7.5
mph
|
670
ft/min
|
7.61361
mph
|
680
ft/min
|
7.72725
mph
|
690
ft/min
|
7.84088
mph
|
700
ft/min
|
7.95452
mph
|
710
ft/min
|
8.06816
mph
|
720
ft/min
|
8.18179
mph
|
730
ft/min
|
8.29543
mph
|
740
ft/min
|
8.40906
mph
|
750
ft/min
|
8.5227
mph
|
760
ft/min
|
8.63634
mph
|
770
ft/min
|
8.74997
mph
|
780
ft/min
|
8.86361
mph
|
790
ft/min
|
8.97724
mph
|
800
ft/min
|
9.09088
mph
|
810
ft/min
|
9.20452
mph
|
820
ft/min
|
9.31815
mph
|
830
ft/min
|
9.43179
mph
|
840
ft/min
|
9.54542
mph
|
850
ft/min
|
9.65906
mph
|
860
ft/min
|
9.7727
mph
|
870
ft/min
|
9.88633
mph
|
880
ft/min
|
10
mph
|
890
ft/min
|
10.1136
mph
|
900
ft/min
|
10.22724
mph
|
910
ft/min
|
10.34088
mph
|
920
ft/min
|
10.45451
mph
|
930
ft/min
|
10.56815
mph
|
940
ft/min
|
10.68178
mph
|
950
ft/min
|
10.79542
mph
|
960
ft/min
|
10.90906
mph
|
970
ft/min
|
11.02269
mph
|
980
ft/min
|
11.13633
mph
|
990
ft/min
|
11.24996
mph
|
1000
ft/min
|
11.3636
mph
|
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