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.
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.
| Millimeters per hour | Miles per hour |
|---|---|
0
mm/h
|
0
mph
|
1000
mm/h
|
0.000621371
mph
|
2000
mm/h
|
0.00124274
mph
|
3000
mm/h
|
0.00186411
mph
|
4000
mm/h
|
0.00248548
mph
|
5000
mm/h
|
0.00310686
mph
|
6000
mm/h
|
0.00372823
mph
|
7000
mm/h
|
0.0043496
mph
|
8000
mm/h
|
0.00497097
mph
|
9000
mm/h
|
0.00559234
mph
|
10000
mm/h
|
0.00621371
mph
|
11000
mm/h
|
0.00683508
mph
|
12000
mm/h
|
0.00745645
mph
|
13000
mm/h
|
0.00807783
mph
|
14000
mm/h
|
0.0086992
mph
|
15000
mm/h
|
0.00932057
mph
|
16000
mm/h
|
0.00994194
mph
|
17000
mm/h
|
0.0105633
mph
|
18000
mm/h
|
0.0111847
mph
|
19000
mm/h
|
0.0118061
mph
|
20000
mm/h
|
0.0124274
mph
|
21000
mm/h
|
0.0130488
mph
|
22000
mm/h
|
0.0136702
mph
|
23000
mm/h
|
0.0142915
mph
|
24000
mm/h
|
0.0149129
mph
|
25000
mm/h
|
0.0155343
mph
|
26000
mm/h
|
0.0161557
mph
|
27000
mm/h
|
0.016777
mph
|
28000
mm/h
|
0.0173984
mph
|
29000
mm/h
|
0.0180198
mph
|
30000
mm/h
|
0.0186411
mph
|
31000
mm/h
|
0.0192625
mph
|
32000
mm/h
|
0.0198839
mph
|
33000
mm/h
|
0.0205052
mph
|
34000
mm/h
|
0.0211266
mph
|
35000
mm/h
|
0.021748
mph
|
36000
mm/h
|
0.0223694
mph
|
37000
mm/h
|
0.0229907
mph
|
38000
mm/h
|
0.0236121
mph
|
39000
mm/h
|
0.0242335
mph
|
40000
mm/h
|
0.0248548
mph
|
41000
mm/h
|
0.0254762
mph
|
42000
mm/h
|
0.0260976
mph
|
43000
mm/h
|
0.026719
mph
|
44000
mm/h
|
0.0273403
mph
|
45000
mm/h
|
0.0279617
mph
|
46000
mm/h
|
0.0285831
mph
|
47000
mm/h
|
0.0292044
mph
|
48000
mm/h
|
0.0298258
mph
|
49000
mm/h
|
0.0304472
mph
|
50000
mm/h
|
0.0310686
mph
|
51000
mm/h
|
0.0316899
mph
|
52000
mm/h
|
0.0323113
mph
|
53000
mm/h
|
0.0329327
mph
|
54000
mm/h
|
0.033554
mph
|
55000
mm/h
|
0.0341754
mph
|
56000
mm/h
|
0.0347968
mph
|
57000
mm/h
|
0.0354182
mph
|
58000
mm/h
|
0.0360395
mph
|
59000
mm/h
|
0.0366609
mph
|
60000
mm/h
|
0.0372823
mph
|
61000
mm/h
|
0.0379036
mph
|
62000
mm/h
|
0.038525
mph
|
63000
mm/h
|
0.0391464
mph
|
64000
mm/h
|
0.0397678
mph
|
65000
mm/h
|
0.0403891
mph
|
66000
mm/h
|
0.0410105
mph
|
67000
mm/h
|
0.0416319
mph
|
68000
mm/h
|
0.0422532
mph
|
69000
mm/h
|
0.0428746
mph
|
70000
mm/h
|
0.043496
mph
|
71000
mm/h
|
0.0441174
mph
|
72000
mm/h
|
0.0447387
mph
|
73000
mm/h
|
0.0453601
mph
|
74000
mm/h
|
0.0459815
mph
|
75000
mm/h
|
0.0466028
mph
|
76000
mm/h
|
0.0472242
mph
|
77000
mm/h
|
0.0478456
mph
|
78000
mm/h
|
0.048467
mph
|
79000
mm/h
|
0.0490883
mph
|
80000
mm/h
|
0.0497097
mph
|
81000
mm/h
|
0.0503311
mph
|
82000
mm/h
|
0.0509524
mph
|
83000
mm/h
|
0.0515738
mph
|
84000
mm/h
|
0.0521952
mph
|
85000
mm/h
|
0.0528166
mph
|
86000
mm/h
|
0.0534379
mph
|
87000
mm/h
|
0.0540593
mph
|
88000
mm/h
|
0.0546807
mph
|
89000
mm/h
|
0.055302
mph
|
90000
mm/h
|
0.0559234
mph
|
91000
mm/h
|
0.0565448
mph
|
92000
mm/h
|
0.0571661
mph
|
93000
mm/h
|
0.0577875
mph
|
94000
mm/h
|
0.0584089
mph
|
95000
mm/h
|
0.0590303
mph
|
96000
mm/h
|
0.0596516
mph
|
97000
mm/h
|
0.060273
mph
|
98000
mm/h
|
0.0608944
mph
|
99000
mm/h
|
0.0615157
mph
|
100000
mm/h
|
0.0621371
mph
|
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