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.
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 | Millimeters per hour |
|---|---|
0
km/h
|
0
mm/h
|
2
km/h
|
2000000
mm/h
|
4
km/h
|
4000000
mm/h
|
6
km/h
|
6000000
mm/h
|
8
km/h
|
8000000
mm/h
|
10
km/h
|
1e+7
mm/h
|
12
km/h
|
1.2e+7
mm/h
|
14
km/h
|
1.4e+7
mm/h
|
16
km/h
|
1.6e+7
mm/h
|
18
km/h
|
1.8e+7
mm/h
|
20
km/h
|
2e+7
mm/h
|
22
km/h
|
2.2e+7
mm/h
|
24
km/h
|
2.4e+7
mm/h
|
26
km/h
|
2.6e+7
mm/h
|
28
km/h
|
2.8e+7
mm/h
|
30
km/h
|
3e+7
mm/h
|
32
km/h
|
3.2e+7
mm/h
|
34
km/h
|
3.4e+7
mm/h
|
36
km/h
|
3.6e+7
mm/h
|
38
km/h
|
3.8e+7
mm/h
|
40
km/h
|
4e+7
mm/h
|
42
km/h
|
4.2e+7
mm/h
|
44
km/h
|
4.4e+7
mm/h
|
46
km/h
|
4.6e+7
mm/h
|
48
km/h
|
4.8e+7
mm/h
|
50
km/h
|
5e+7
mm/h
|
52
km/h
|
5.2e+7
mm/h
|
54
km/h
|
5.4e+7
mm/h
|
56
km/h
|
5.6e+7
mm/h
|
58
km/h
|
5.8e+7
mm/h
|
60
km/h
|
6e+7
mm/h
|
62
km/h
|
6.2e+7
mm/h
|
64
km/h
|
6.4e+7
mm/h
|
66
km/h
|
6.6e+7
mm/h
|
68
km/h
|
6.8e+7
mm/h
|
70
km/h
|
7e+7
mm/h
|
72
km/h
|
7.2e+7
mm/h
|
74
km/h
|
7.4e+7
mm/h
|
76
km/h
|
7.6e+7
mm/h
|
78
km/h
|
7.8e+7
mm/h
|
80
km/h
|
8e+7
mm/h
|
82
km/h
|
8.2e+7
mm/h
|
84
km/h
|
8.4e+7
mm/h
|
86
km/h
|
8.6e+7
mm/h
|
88
km/h
|
8.8e+7
mm/h
|
90
km/h
|
9e+7
mm/h
|
92
km/h
|
9.2e+7
mm/h
|
94
km/h
|
9.4e+7
mm/h
|
96
km/h
|
9.6e+7
mm/h
|
98
km/h
|
9.8e+7
mm/h
|
100
km/h
|
1e+8
mm/h
|
102
km/h
|
1.02e+8
mm/h
|
104
km/h
|
1.04e+8
mm/h
|
106
km/h
|
1.06e+8
mm/h
|
108
km/h
|
1.08e+8
mm/h
|
110
km/h
|
1.1e+8
mm/h
|
112
km/h
|
1.12e+8
mm/h
|
114
km/h
|
1.14e+8
mm/h
|
116
km/h
|
1.16e+8
mm/h
|
118
km/h
|
1.18e+8
mm/h
|
120
km/h
|
1.2e+8
mm/h
|
122
km/h
|
1.22e+8
mm/h
|
124
km/h
|
1.24e+8
mm/h
|
126
km/h
|
1.26e+8
mm/h
|
128
km/h
|
1.28e+8
mm/h
|
130
km/h
|
1.3e+8
mm/h
|
132
km/h
|
1.32e+8
mm/h
|
134
km/h
|
1.34e+8
mm/h
|
136
km/h
|
1.36e+8
mm/h
|
138
km/h
|
1.38e+8
mm/h
|
140
km/h
|
1.4e+8
mm/h
|
142
km/h
|
1.42e+8
mm/h
|
144
km/h
|
1.44e+8
mm/h
|
146
km/h
|
1.46e+8
mm/h
|
148
km/h
|
1.48e+8
mm/h
|
150
km/h
|
1.5e+8
mm/h
|
152
km/h
|
1.52e+8
mm/h
|
154
km/h
|
1.54e+8
mm/h
|
156
km/h
|
1.56e+8
mm/h
|
158
km/h
|
1.58e+8
mm/h
|
160
km/h
|
1.6e+8
mm/h
|
162
km/h
|
1.62e+8
mm/h
|
164
km/h
|
1.64e+8
mm/h
|
166
km/h
|
1.66e+8
mm/h
|
168
km/h
|
1.68e+8
mm/h
|
170
km/h
|
1.7e+8
mm/h
|
172
km/h
|
1.72e+8
mm/h
|
174
km/h
|
1.74e+8
mm/h
|
176
km/h
|
1.76e+8
mm/h
|
178
km/h
|
1.78e+8
mm/h
|
180
km/h
|
1.8e+8
mm/h
|
182
km/h
|
1.82e+8
mm/h
|
184
km/h
|
1.84e+8
mm/h
|
186
km/h
|
1.86e+8
mm/h
|
188
km/h
|
1.88e+8
mm/h
|
190
km/h
|
1.9e+8
mm/h
|
192
km/h
|
1.92e+8
mm/h
|
194
km/h
|
1.94e+8
mm/h
|
196
km/h
|
1.96e+8
mm/h
|
198
km/h
|
1.98e+8
mm/h
|
200
km/h
|
2e+8
mm/h
|
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