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.
Metres per second (m/s) may seem inconspicuous, but it plays a critical role in understanding speed and velocity in scientific contexts. The unit underpins numerous fundamental concepts in physics and engineering, such as calculating the speed of sound at approximately 343 m/s in air at room temperature. This speed metric is also central to space exploration, where spacecraft velocity is often measured in meters per second to ensure precision in navigation and successful missions.
Beyond Earth, Jupiter’s moon, Io, erupts volcanic plumes that reach speeds of over 1,000 m/s, showcasing this unit’s application in celestial phenomena. Transitioning to daily life, elite athletes can clock speeds around 10 m/s during sprints, a testament to human capability. By providing a consistent metric, meters per second serves as a universal bridge across varied disciplines and contexts.
| Millimeters per hour | Metres per second |
|---|---|
0
mm/h
|
0
m/s
|
1000
mm/h
|
0.000277778
m/s
|
2000
mm/h
|
0.000555556
m/s
|
3000
mm/h
|
0.000833333
m/s
|
4000
mm/h
|
0.00111111
m/s
|
5000
mm/h
|
0.00138889
m/s
|
6000
mm/h
|
0.00166667
m/s
|
7000
mm/h
|
0.00194444
m/s
|
8000
mm/h
|
0.00222222
m/s
|
9000
mm/h
|
0.0025
m/s
|
10000
mm/h
|
0.00277778
m/s
|
11000
mm/h
|
0.00305556
m/s
|
12000
mm/h
|
0.00333333
m/s
|
13000
mm/h
|
0.00361111
m/s
|
14000
mm/h
|
0.00388889
m/s
|
15000
mm/h
|
0.00416667
m/s
|
16000
mm/h
|
0.00444444
m/s
|
17000
mm/h
|
0.00472222
m/s
|
18000
mm/h
|
0.005
m/s
|
19000
mm/h
|
0.00527778
m/s
|
20000
mm/h
|
0.00555556
m/s
|
21000
mm/h
|
0.00583333
m/s
|
22000
mm/h
|
0.00611111
m/s
|
23000
mm/h
|
0.00638889
m/s
|
24000
mm/h
|
0.00666667
m/s
|
25000
mm/h
|
0.00694444
m/s
|
26000
mm/h
|
0.00722222
m/s
|
27000
mm/h
|
0.0075
m/s
|
28000
mm/h
|
0.00777778
m/s
|
29000
mm/h
|
0.00805556
m/s
|
30000
mm/h
|
0.00833333
m/s
|
31000
mm/h
|
0.00861111
m/s
|
32000
mm/h
|
0.00888889
m/s
|
33000
mm/h
|
0.00916667
m/s
|
34000
mm/h
|
0.00944444
m/s
|
35000
mm/h
|
0.00972222
m/s
|
36000
mm/h
|
0.01
m/s
|
37000
mm/h
|
0.0102778
m/s
|
38000
mm/h
|
0.0105556
m/s
|
39000
mm/h
|
0.0108333
m/s
|
40000
mm/h
|
0.0111111
m/s
|
41000
mm/h
|
0.0113889
m/s
|
42000
mm/h
|
0.0116667
m/s
|
43000
mm/h
|
0.0119444
m/s
|
44000
mm/h
|
0.0122222
m/s
|
45000
mm/h
|
0.0125
m/s
|
46000
mm/h
|
0.0127778
m/s
|
47000
mm/h
|
0.0130556
m/s
|
48000
mm/h
|
0.0133333
m/s
|
49000
mm/h
|
0.0136111
m/s
|
50000
mm/h
|
0.0138889
m/s
|
51000
mm/h
|
0.0141667
m/s
|
52000
mm/h
|
0.0144444
m/s
|
53000
mm/h
|
0.0147222
m/s
|
54000
mm/h
|
0.015
m/s
|
55000
mm/h
|
0.0152778
m/s
|
56000
mm/h
|
0.0155556
m/s
|
57000
mm/h
|
0.0158333
m/s
|
58000
mm/h
|
0.0161111
m/s
|
59000
mm/h
|
0.0163889
m/s
|
60000
mm/h
|
0.0166667
m/s
|
61000
mm/h
|
0.0169444
m/s
|
62000
mm/h
|
0.0172222
m/s
|
63000
mm/h
|
0.0175
m/s
|
64000
mm/h
|
0.0177778
m/s
|
65000
mm/h
|
0.0180556
m/s
|
66000
mm/h
|
0.0183333
m/s
|
67000
mm/h
|
0.0186111
m/s
|
68000
mm/h
|
0.0188889
m/s
|
69000
mm/h
|
0.0191667
m/s
|
70000
mm/h
|
0.0194444
m/s
|
71000
mm/h
|
0.0197222
m/s
|
72000
mm/h
|
0.02
m/s
|
73000
mm/h
|
0.0202778
m/s
|
74000
mm/h
|
0.0205556
m/s
|
75000
mm/h
|
0.0208333
m/s
|
76000
mm/h
|
0.0211111
m/s
|
77000
mm/h
|
0.0213889
m/s
|
78000
mm/h
|
0.0216667
m/s
|
79000
mm/h
|
0.0219444
m/s
|
80000
mm/h
|
0.0222222
m/s
|
81000
mm/h
|
0.0225
m/s
|
82000
mm/h
|
0.0227778
m/s
|
83000
mm/h
|
0.0230556
m/s
|
84000
mm/h
|
0.0233333
m/s
|
85000
mm/h
|
0.0236111
m/s
|
86000
mm/h
|
0.0238889
m/s
|
87000
mm/h
|
0.0241667
m/s
|
88000
mm/h
|
0.0244444
m/s
|
89000
mm/h
|
0.0247222
m/s
|
90000
mm/h
|
0.025
m/s
|
91000
mm/h
|
0.0252778
m/s
|
92000
mm/h
|
0.0255556
m/s
|
93000
mm/h
|
0.0258333
m/s
|
94000
mm/h
|
0.0261111
m/s
|
95000
mm/h
|
0.0263889
m/s
|
96000
mm/h
|
0.0266667
m/s
|
97000
mm/h
|
0.0269444
m/s
|
98000
mm/h
|
0.0272222
m/s
|
99000
mm/h
|
0.0275
m/s
|
100000
mm/h
|
0.0277778
m/s
|
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