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 second (ft/s) is a unit commonly used to measure velocity, particularly in the United States. It’s fascinating to note that this unit offers a unique perspective on speed, especially when compared to more universal units like meters per second. For instance, the speed of sound travels at approximately 1,125 feet per second, illustrating just how fast sound waves can move. Moreover, this unit is an essential part of the British Imperial and U.S. customary systems, embodying the historical evolution of measurement standards.
Interestingly, foot per second was also a critical measure in ancient construction and engineering, where precision in the rate of stone placement or water flow impacted architectural marvels. Today, it’s frequently applied in sports science to analyze athletic performances, such as a sprinter’s burst off the starting blocks or the flight speed of a baseball pitcher’s throw. This unit continues to bridge past engineering feats with modern technological applications, providing a unique linkage of history and contemporary science.
| Millimeters per hour | Feet per second |
|---|---|
0
mm/h
|
0
ft/s
|
1000
mm/h
|
0.000911345
ft/s
|
2000
mm/h
|
0.00182269
ft/s
|
3000
mm/h
|
0.00273403
ft/s
|
4000
mm/h
|
0.00364538
ft/s
|
5000
mm/h
|
0.00455672
ft/s
|
6000
mm/h
|
0.00546807
ft/s
|
7000
mm/h
|
0.00637941
ft/s
|
8000
mm/h
|
0.00729076
ft/s
|
9000
mm/h
|
0.0082021
ft/s
|
10000
mm/h
|
0.00911345
ft/s
|
11000
mm/h
|
0.0100248
ft/s
|
12000
mm/h
|
0.0109361
ft/s
|
13000
mm/h
|
0.0118475
ft/s
|
14000
mm/h
|
0.0127588
ft/s
|
15000
mm/h
|
0.0136702
ft/s
|
16000
mm/h
|
0.0145815
ft/s
|
17000
mm/h
|
0.0154929
ft/s
|
18000
mm/h
|
0.0164042
ft/s
|
19000
mm/h
|
0.0173155
ft/s
|
20000
mm/h
|
0.0182269
ft/s
|
21000
mm/h
|
0.0191382
ft/s
|
22000
mm/h
|
0.0200496
ft/s
|
23000
mm/h
|
0.0209609
ft/s
|
24000
mm/h
|
0.0218723
ft/s
|
25000
mm/h
|
0.0227836
ft/s
|
26000
mm/h
|
0.023695
ft/s
|
27000
mm/h
|
0.0246063
ft/s
|
28000
mm/h
|
0.0255177
ft/s
|
29000
mm/h
|
0.026429
ft/s
|
30000
mm/h
|
0.0273403
ft/s
|
31000
mm/h
|
0.0282517
ft/s
|
32000
mm/h
|
0.029163
ft/s
|
33000
mm/h
|
0.0300744
ft/s
|
34000
mm/h
|
0.0309857
ft/s
|
35000
mm/h
|
0.0318971
ft/s
|
36000
mm/h
|
0.0328084
ft/s
|
37000
mm/h
|
0.0337198
ft/s
|
38000
mm/h
|
0.0346311
ft/s
|
39000
mm/h
|
0.0355424
ft/s
|
40000
mm/h
|
0.0364538
ft/s
|
41000
mm/h
|
0.0373651
ft/s
|
42000
mm/h
|
0.0382765
ft/s
|
43000
mm/h
|
0.0391878
ft/s
|
44000
mm/h
|
0.0400992
ft/s
|
45000
mm/h
|
0.0410105
ft/s
|
46000
mm/h
|
0.0419219
ft/s
|
47000
mm/h
|
0.0428332
ft/s
|
48000
mm/h
|
0.0437445
ft/s
|
49000
mm/h
|
0.0446559
ft/s
|
50000
mm/h
|
0.0455672
ft/s
|
51000
mm/h
|
0.0464786
ft/s
|
52000
mm/h
|
0.0473899
ft/s
|
53000
mm/h
|
0.0483013
ft/s
|
54000
mm/h
|
0.0492126
ft/s
|
55000
mm/h
|
0.050124
ft/s
|
56000
mm/h
|
0.0510353
ft/s
|
57000
mm/h
|
0.0519466
ft/s
|
58000
mm/h
|
0.052858
ft/s
|
59000
mm/h
|
0.0537693
ft/s
|
60000
mm/h
|
0.0546807
ft/s
|
61000
mm/h
|
0.055592
ft/s
|
62000
mm/h
|
0.0565034
ft/s
|
63000
mm/h
|
0.0574147
ft/s
|
64000
mm/h
|
0.0583261
ft/s
|
65000
mm/h
|
0.0592374
ft/s
|
66000
mm/h
|
0.0601487
ft/s
|
67000
mm/h
|
0.0610601
ft/s
|
68000
mm/h
|
0.0619714
ft/s
|
69000
mm/h
|
0.0628828
ft/s
|
70000
mm/h
|
0.0637941
ft/s
|
71000
mm/h
|
0.0647055
ft/s
|
72000
mm/h
|
0.0656168
ft/s
|
73000
mm/h
|
0.0665282
ft/s
|
74000
mm/h
|
0.0674395
ft/s
|
75000
mm/h
|
0.0683508
ft/s
|
76000
mm/h
|
0.0692622
ft/s
|
77000
mm/h
|
0.0701735
ft/s
|
78000
mm/h
|
0.0710849
ft/s
|
79000
mm/h
|
0.0719962
ft/s
|
80000
mm/h
|
0.0729076
ft/s
|
81000
mm/h
|
0.0738189
ft/s
|
82000
mm/h
|
0.0747303
ft/s
|
83000
mm/h
|
0.0756416
ft/s
|
84000
mm/h
|
0.076553
ft/s
|
85000
mm/h
|
0.0774643
ft/s
|
86000
mm/h
|
0.0783756
ft/s
|
87000
mm/h
|
0.079287
ft/s
|
88000
mm/h
|
0.0801983
ft/s
|
89000
mm/h
|
0.0811097
ft/s
|
90000
mm/h
|
0.082021
ft/s
|
91000
mm/h
|
0.0829324
ft/s
|
92000
mm/h
|
0.0838437
ft/s
|
93000
mm/h
|
0.0847551
ft/s
|
94000
mm/h
|
0.0856664
ft/s
|
95000
mm/h
|
0.0865777
ft/s
|
96000
mm/h
|
0.0874891
ft/s
|
97000
mm/h
|
0.0884004
ft/s
|
98000
mm/h
|
0.0893118
ft/s
|
99000
mm/h
|
0.0902231
ft/s
|
100000
mm/h
|
0.0911345
ft/s
|
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