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.
Kilometres per hour (km/h) is a widely used metric unit of speed, especially on roads and highways around the world. Interestingly, despite its global prevalence, the U.S. primarily uses miles per hour. However, km/h is the standard for most countries, offering a glimpse into global unity as it’s part of the International System of Units (SI). The history of speed limits tied to km/h is quite fascinating. The first speed limit laws, introduced in the United Kingdom in the 19th century, regulated horse-drawn carriages, long before motor vehicles were common. Today, km/h aids not only in measuring speed but also in showcasing technological advancements in transportation engineering as speeds increase with improved vehicle designs.
| Millimeters per hour | Kilometres per hour |
|---|---|
0
mm/h
|
0
km/h
|
1000
mm/h
|
0.001
km/h
|
2000
mm/h
|
0.002
km/h
|
3000
mm/h
|
0.003
km/h
|
4000
mm/h
|
0.004
km/h
|
5000
mm/h
|
0.005
km/h
|
6000
mm/h
|
0.006
km/h
|
7000
mm/h
|
0.007
km/h
|
8000
mm/h
|
0.008
km/h
|
9000
mm/h
|
0.009
km/h
|
10000
mm/h
|
0.01
km/h
|
11000
mm/h
|
0.011
km/h
|
12000
mm/h
|
0.012
km/h
|
13000
mm/h
|
0.013
km/h
|
14000
mm/h
|
0.014
km/h
|
15000
mm/h
|
0.015
km/h
|
16000
mm/h
|
0.016
km/h
|
17000
mm/h
|
0.017
km/h
|
18000
mm/h
|
0.018
km/h
|
19000
mm/h
|
0.019
km/h
|
20000
mm/h
|
0.02
km/h
|
21000
mm/h
|
0.021
km/h
|
22000
mm/h
|
0.022
km/h
|
23000
mm/h
|
0.023
km/h
|
24000
mm/h
|
0.024
km/h
|
25000
mm/h
|
0.025
km/h
|
26000
mm/h
|
0.026
km/h
|
27000
mm/h
|
0.027
km/h
|
28000
mm/h
|
0.028
km/h
|
29000
mm/h
|
0.029
km/h
|
30000
mm/h
|
0.03
km/h
|
31000
mm/h
|
0.031
km/h
|
32000
mm/h
|
0.032
km/h
|
33000
mm/h
|
0.033
km/h
|
34000
mm/h
|
0.034
km/h
|
35000
mm/h
|
0.035
km/h
|
36000
mm/h
|
0.036
km/h
|
37000
mm/h
|
0.037
km/h
|
38000
mm/h
|
0.038
km/h
|
39000
mm/h
|
0.039
km/h
|
40000
mm/h
|
0.04
km/h
|
41000
mm/h
|
0.041
km/h
|
42000
mm/h
|
0.042
km/h
|
43000
mm/h
|
0.043
km/h
|
44000
mm/h
|
0.044
km/h
|
45000
mm/h
|
0.045
km/h
|
46000
mm/h
|
0.046
km/h
|
47000
mm/h
|
0.047
km/h
|
48000
mm/h
|
0.048
km/h
|
49000
mm/h
|
0.049
km/h
|
50000
mm/h
|
0.05
km/h
|
51000
mm/h
|
0.051
km/h
|
52000
mm/h
|
0.052
km/h
|
53000
mm/h
|
0.053
km/h
|
54000
mm/h
|
0.054
km/h
|
55000
mm/h
|
0.055
km/h
|
56000
mm/h
|
0.056
km/h
|
57000
mm/h
|
0.057
km/h
|
58000
mm/h
|
0.058
km/h
|
59000
mm/h
|
0.059
km/h
|
60000
mm/h
|
0.06
km/h
|
61000
mm/h
|
0.061
km/h
|
62000
mm/h
|
0.062
km/h
|
63000
mm/h
|
0.063
km/h
|
64000
mm/h
|
0.064
km/h
|
65000
mm/h
|
0.065
km/h
|
66000
mm/h
|
0.066
km/h
|
67000
mm/h
|
0.067
km/h
|
68000
mm/h
|
0.068
km/h
|
69000
mm/h
|
0.069
km/h
|
70000
mm/h
|
0.07
km/h
|
71000
mm/h
|
0.071
km/h
|
72000
mm/h
|
0.072
km/h
|
73000
mm/h
|
0.073
km/h
|
74000
mm/h
|
0.074
km/h
|
75000
mm/h
|
0.075
km/h
|
76000
mm/h
|
0.076
km/h
|
77000
mm/h
|
0.077
km/h
|
78000
mm/h
|
0.078
km/h
|
79000
mm/h
|
0.079
km/h
|
80000
mm/h
|
0.08
km/h
|
81000
mm/h
|
0.081
km/h
|
82000
mm/h
|
0.082
km/h
|
83000
mm/h
|
0.083
km/h
|
84000
mm/h
|
0.084
km/h
|
85000
mm/h
|
0.085
km/h
|
86000
mm/h
|
0.086
km/h
|
87000
mm/h
|
0.087
km/h
|
88000
mm/h
|
0.088
km/h
|
89000
mm/h
|
0.089
km/h
|
90000
mm/h
|
0.09
km/h
|
91000
mm/h
|
0.091
km/h
|
92000
mm/h
|
0.092
km/h
|
93000
mm/h
|
0.093
km/h
|
94000
mm/h
|
0.094
km/h
|
95000
mm/h
|
0.095
km/h
|
96000
mm/h
|
0.096
km/h
|
97000
mm/h
|
0.097
km/h
|
98000
mm/h
|
0.098
km/h
|
99000
mm/h
|
0.099
km/h
|
100000
mm/h
|
0.1
km/h
|
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