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.
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.
| Millimeters per hour | Feet per minute |
|---|---|
0
mm/h
|
0
ft/min
|
1000
mm/h
|
0.0546808
ft/min
|
2000
mm/h
|
0.109362
ft/min
|
3000
mm/h
|
0.164043
ft/min
|
4000
mm/h
|
0.218723
ft/min
|
5000
mm/h
|
0.273404
ft/min
|
6000
mm/h
|
0.328085
ft/min
|
7000
mm/h
|
0.382766
ft/min
|
8000
mm/h
|
0.437447
ft/min
|
9000
mm/h
|
0.492128
ft/min
|
10000
mm/h
|
0.546808
ft/min
|
11000
mm/h
|
0.601489
ft/min
|
12000
mm/h
|
0.65617
ft/min
|
13000
mm/h
|
0.710851
ft/min
|
14000
mm/h
|
0.765532
ft/min
|
15000
mm/h
|
0.820213
ft/min
|
16000
mm/h
|
0.874893
ft/min
|
17000
mm/h
|
0.929574
ft/min
|
18000
mm/h
|
0.984255
ft/min
|
19000
mm/h
|
1.03894
ft/min
|
20000
mm/h
|
1.09362
ft/min
|
21000
mm/h
|
1.1483
ft/min
|
22000
mm/h
|
1.20298
ft/min
|
23000
mm/h
|
1.25766
ft/min
|
24000
mm/h
|
1.31234
ft/min
|
25000
mm/h
|
1.36702
ft/min
|
26000
mm/h
|
1.4217
ft/min
|
27000
mm/h
|
1.47638
ft/min
|
28000
mm/h
|
1.53106
ft/min
|
29000
mm/h
|
1.58574
ft/min
|
30000
mm/h
|
1.64043
ft/min
|
31000
mm/h
|
1.69511
ft/min
|
32000
mm/h
|
1.74979
ft/min
|
33000
mm/h
|
1.80447
ft/min
|
34000
mm/h
|
1.85915
ft/min
|
35000
mm/h
|
1.91383
ft/min
|
36000
mm/h
|
1.96851
ft/min
|
37000
mm/h
|
2.02319
ft/min
|
38000
mm/h
|
2.07787
ft/min
|
39000
mm/h
|
2.13255
ft/min
|
40000
mm/h
|
2.18723
ft/min
|
41000
mm/h
|
2.24191
ft/min
|
42000
mm/h
|
2.2966
ft/min
|
43000
mm/h
|
2.35128
ft/min
|
44000
mm/h
|
2.40596
ft/min
|
45000
mm/h
|
2.46064
ft/min
|
46000
mm/h
|
2.51532
ft/min
|
47000
mm/h
|
2.57
ft/min
|
48000
mm/h
|
2.62468
ft/min
|
49000
mm/h
|
2.67936
ft/min
|
50000
mm/h
|
2.73404
ft/min
|
51000
mm/h
|
2.78872
ft/min
|
52000
mm/h
|
2.8434
ft/min
|
53000
mm/h
|
2.89808
ft/min
|
54000
mm/h
|
2.95277
ft/min
|
55000
mm/h
|
3.00745
ft/min
|
56000
mm/h
|
3.06213
ft/min
|
57000
mm/h
|
3.11681
ft/min
|
58000
mm/h
|
3.17149
ft/min
|
59000
mm/h
|
3.22617
ft/min
|
60000
mm/h
|
3.28085
ft/min
|
61000
mm/h
|
3.33553
ft/min
|
62000
mm/h
|
3.39021
ft/min
|
63000
mm/h
|
3.44489
ft/min
|
64000
mm/h
|
3.49957
ft/min
|
65000
mm/h
|
3.55425
ft/min
|
66000
mm/h
|
3.60894
ft/min
|
67000
mm/h
|
3.66362
ft/min
|
68000
mm/h
|
3.7183
ft/min
|
69000
mm/h
|
3.77298
ft/min
|
70000
mm/h
|
3.82766
ft/min
|
71000
mm/h
|
3.88234
ft/min
|
72000
mm/h
|
3.93702
ft/min
|
73000
mm/h
|
3.9917
ft/min
|
74000
mm/h
|
4.04638
ft/min
|
75000
mm/h
|
4.10106
ft/min
|
76000
mm/h
|
4.15574
ft/min
|
77000
mm/h
|
4.21042
ft/min
|
78000
mm/h
|
4.26511
ft/min
|
79000
mm/h
|
4.31979
ft/min
|
80000
mm/h
|
4.37447
ft/min
|
81000
mm/h
|
4.42915
ft/min
|
82000
mm/h
|
4.48383
ft/min
|
83000
mm/h
|
4.53851
ft/min
|
84000
mm/h
|
4.59319
ft/min
|
85000
mm/h
|
4.64787
ft/min
|
86000
mm/h
|
4.70255
ft/min
|
87000
mm/h
|
4.75723
ft/min
|
88000
mm/h
|
4.81191
ft/min
|
89000
mm/h
|
4.86659
ft/min
|
90000
mm/h
|
4.92128
ft/min
|
91000
mm/h
|
4.97596
ft/min
|
92000
mm/h
|
5.03064
ft/min
|
93000
mm/h
|
5.08532
ft/min
|
94000
mm/h
|
5.14
ft/min
|
95000
mm/h
|
5.19468
ft/min
|
96000
mm/h
|
5.24936
ft/min
|
97000
mm/h
|
5.30404
ft/min
|
98000
mm/h
|
5.35872
ft/min
|
99000
mm/h
|
5.4134
ft/min
|
100000
mm/h
|
5.46808
ft/min
|
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