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.
Millimeter per hour is a unit of speed often used to measure the rate of slow-moving phenomena, such as the growth of glaciers or the flow of sap in trees. Compared to everyday speeds like kilometers per hour, millimeters per hour might seem almost imperceptible, yet this unit is crucial for understanding natural processes that occur over extended periods.
Interestingly, certain glaciers move only a few millimeters per hour, but over weeks, months, and years, this glacial creep dramatically shapes entire landscapes. Meanwhile, indoor humidity control systems can measure evaporation rates in millimeters per hour to optimize environmental conditions. This seemingly minuscule unit underscores the importance of precision in scientific measurements, highlighting the incredible variance in speeds and the vast scales of time and distance we explore.
| Feet per minute | Millimeters per hour |
|---|---|
0
ft/min
|
0
mm/h
|
10
ft/min
|
182879.41478
mm/h
|
20
ft/min
|
365758.82957
mm/h
|
30
ft/min
|
548638.24435
mm/h
|
40
ft/min
|
731517.65914
mm/h
|
50
ft/min
|
914397.07392
mm/h
|
60
ft/min
|
1097276.4887
mm/h
|
70
ft/min
|
1280155.90349
mm/h
|
80
ft/min
|
1463035.31827
mm/h
|
90
ft/min
|
1645914.73306
mm/h
|
100
ft/min
|
1828794.14784
mm/h
|
110
ft/min
|
2011673.56262
mm/h
|
120
ft/min
|
2194552.97741
mm/h
|
130
ft/min
|
2377432.39219
mm/h
|
140
ft/min
|
2560311.80698
mm/h
|
150
ft/min
|
2743191.22176
mm/h
|
160
ft/min
|
2926070.63654
mm/h
|
170
ft/min
|
3108950.05133
mm/h
|
180
ft/min
|
3291829.46611
mm/h
|
190
ft/min
|
3474708.8809
mm/h
|
200
ft/min
|
3657588.29568
mm/h
|
210
ft/min
|
3840467.71046
mm/h
|
220
ft/min
|
4023347.12525
mm/h
|
230
ft/min
|
4206226.54003
mm/h
|
240
ft/min
|
4389105.95482
mm/h
|
250
ft/min
|
4571985.3696
mm/h
|
260
ft/min
|
4754864.78438
mm/h
|
270
ft/min
|
4937744.19917
mm/h
|
280
ft/min
|
5120623.61395
mm/h
|
290
ft/min
|
5303503.02874
mm/h
|
300
ft/min
|
5486382.44352
mm/h
|
310
ft/min
|
5669261.8583
mm/h
|
320
ft/min
|
5852141.27309
mm/h
|
330
ft/min
|
6035020.68787
mm/h
|
340
ft/min
|
6217900.10266
mm/h
|
350
ft/min
|
6400779.51744
mm/h
|
360
ft/min
|
6583658.93222
mm/h
|
370
ft/min
|
6766538.34701
mm/h
|
380
ft/min
|
6949417.76179
mm/h
|
390
ft/min
|
7132297.17658
mm/h
|
400
ft/min
|
7315176.59136
mm/h
|
410
ft/min
|
7498056.00614
mm/h
|
420
ft/min
|
7680935.42093
mm/h
|
430
ft/min
|
7863814.83571
mm/h
|
440
ft/min
|
8046694.2505
mm/h
|
450
ft/min
|
8229573.66528
mm/h
|
460
ft/min
|
8412453.08006
mm/h
|
470
ft/min
|
8595332.49485
mm/h
|
480
ft/min
|
8778211.90963
mm/h
|
490
ft/min
|
8961091.32442
mm/h
|
500
ft/min
|
9143970.7392
mm/h
|
510
ft/min
|
9326850.15398
mm/h
|
520
ft/min
|
9509729.56877
mm/h
|
530
ft/min
|
9692608.98355
mm/h
|
540
ft/min
|
9875488.39834
mm/h
|
550
ft/min
|
1.00584e+7
mm/h
|
560
ft/min
|
1.02412e+7
mm/h
|
570
ft/min
|
1.04241e+7
mm/h
|
580
ft/min
|
1.0607e+7
mm/h
|
590
ft/min
|
1.07899e+7
mm/h
|
600
ft/min
|
1.09728e+7
mm/h
|
610
ft/min
|
1.11556e+7
mm/h
|
620
ft/min
|
1.13385e+7
mm/h
|
630
ft/min
|
1.15214e+7
mm/h
|
640
ft/min
|
1.17043e+7
mm/h
|
650
ft/min
|
1.18872e+7
mm/h
|
660
ft/min
|
1.207e+7
mm/h
|
670
ft/min
|
1.22529e+7
mm/h
|
680
ft/min
|
1.24358e+7
mm/h
|
690
ft/min
|
1.26187e+7
mm/h
|
700
ft/min
|
1.28016e+7
mm/h
|
710
ft/min
|
1.29844e+7
mm/h
|
720
ft/min
|
1.31673e+7
mm/h
|
730
ft/min
|
1.33502e+7
mm/h
|
740
ft/min
|
1.35331e+7
mm/h
|
750
ft/min
|
1.3716e+7
mm/h
|
760
ft/min
|
1.38988e+7
mm/h
|
770
ft/min
|
1.40817e+7
mm/h
|
780
ft/min
|
1.42646e+7
mm/h
|
790
ft/min
|
1.44475e+7
mm/h
|
800
ft/min
|
1.46304e+7
mm/h
|
810
ft/min
|
1.48132e+7
mm/h
|
820
ft/min
|
1.49961e+7
mm/h
|
830
ft/min
|
1.5179e+7
mm/h
|
840
ft/min
|
1.53619e+7
mm/h
|
850
ft/min
|
1.55448e+7
mm/h
|
860
ft/min
|
1.57276e+7
mm/h
|
870
ft/min
|
1.59105e+7
mm/h
|
880
ft/min
|
1.60934e+7
mm/h
|
890
ft/min
|
1.62763e+7
mm/h
|
900
ft/min
|
1.64591e+7
mm/h
|
910
ft/min
|
1.6642e+7
mm/h
|
920
ft/min
|
1.68249e+7
mm/h
|
930
ft/min
|
1.70078e+7
mm/h
|
940
ft/min
|
1.71907e+7
mm/h
|
950
ft/min
|
1.73735e+7
mm/h
|
960
ft/min
|
1.75564e+7
mm/h
|
970
ft/min
|
1.77393e+7
mm/h
|
980
ft/min
|
1.79222e+7
mm/h
|
990
ft/min
|
1.81051e+7
mm/h
|
1000
ft/min
|
1.82879e+7
mm/h
|
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