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.
Inches per hour (iph) might seem like a peculiar unit of speed, but it plays a critical role in specific fields such as meteorology and engineering. This unit is often employed to measure precipitation rates, as it provides a precise gauge for predicting flooding events and soil absorption rates. By understanding precipitation in inches per hour, meteorologists can issue timely warnings and help communities prepare for extreme weather conditions.
Beyond weather, inches per hour can also be significant in manufacturing. For instance, when a machine needs to move with precision while applying adhesives or paints, the speed may be calibrated in iph to ensure accurate application and quality control. It’s a reminder of how even seemingly simple units have complex and vital applications across various industries.
| Kilometres per hour | Inches per hour |
|---|---|
0
km/h
|
0
in/h
|
2
km/h
|
78754.27025
in/h
|
4
km/h
|
157508.54049
in/h
|
6
km/h
|
236262.81074
in/h
|
8
km/h
|
315017.08098
in/h
|
10
km/h
|
393771.35123
in/h
|
12
km/h
|
472525.62147
in/h
|
14
km/h
|
551279.89172
in/h
|
16
km/h
|
630034.16196
in/h
|
18
km/h
|
708788.43221
in/h
|
20
km/h
|
787542.70246
in/h
|
22
km/h
|
866296.9727
in/h
|
24
km/h
|
945051.24295
in/h
|
26
km/h
|
1023805.51319
in/h
|
28
km/h
|
1102559.78344
in/h
|
30
km/h
|
1181314.05368
in/h
|
32
km/h
|
1260068.32393
in/h
|
34
km/h
|
1338822.59417
in/h
|
36
km/h
|
1417576.86442
in/h
|
38
km/h
|
1496331.13467
in/h
|
40
km/h
|
1575085.40491
in/h
|
42
km/h
|
1653839.67516
in/h
|
44
km/h
|
1732593.9454
in/h
|
46
km/h
|
1811348.21565
in/h
|
48
km/h
|
1890102.48589
in/h
|
50
km/h
|
1968856.75614
in/h
|
52
km/h
|
2047611.02638
in/h
|
54
km/h
|
2126365.29663
in/h
|
56
km/h
|
2205119.56688
in/h
|
58
km/h
|
2283873.83712
in/h
|
60
km/h
|
2362628.10737
in/h
|
62
km/h
|
2441382.37761
in/h
|
64
km/h
|
2520136.64786
in/h
|
66
km/h
|
2598890.9181
in/h
|
68
km/h
|
2677645.18835
in/h
|
70
km/h
|
2756399.45859
in/h
|
72
km/h
|
2835153.72884
in/h
|
74
km/h
|
2913908
in/h
|
76
km/h
|
2992662.26933
in/h
|
78
km/h
|
3071416.53958
in/h
|
80
km/h
|
3150170.80982
in/h
|
82
km/h
|
3228925.08007
in/h
|
84
km/h
|
3307679.35031
in/h
|
86
km/h
|
3386433.62056
in/h
|
88
km/h
|
3465187.8908
in/h
|
90
km/h
|
3543942.16105
in/h
|
92
km/h
|
3622696.43129
in/h
|
94
km/h
|
3701450.70154
in/h
|
96
km/h
|
3780204.97179
in/h
|
98
km/h
|
3858959.24203
in/h
|
100
km/h
|
3937713.51228
in/h
|
102
km/h
|
4016467.78252
in/h
|
104
km/h
|
4095222.05277
in/h
|
106
km/h
|
4173976.32301
in/h
|
108
km/h
|
4252730.59326
in/h
|
110
km/h
|
4331484.8635
in/h
|
112
km/h
|
4410239.13375
in/h
|
114
km/h
|
4488993.404
in/h
|
116
km/h
|
4567747.67424
in/h
|
118
km/h
|
4646501.94449
in/h
|
120
km/h
|
4725256.21473
in/h
|
122
km/h
|
4804010.48498
in/h
|
124
km/h
|
4882764.75522
in/h
|
126
km/h
|
4961519.02547
in/h
|
128
km/h
|
5040273.29571
in/h
|
130
km/h
|
5119027.56596
in/h
|
132
km/h
|
5197781.83621
in/h
|
134
km/h
|
5276536.10645
in/h
|
136
km/h
|
5355290.3767
in/h
|
138
km/h
|
5434044.64694
in/h
|
140
km/h
|
5512798.91719
in/h
|
142
km/h
|
5591553.18743
in/h
|
144
km/h
|
5670307.45768
in/h
|
146
km/h
|
5749061.72792
in/h
|
148
km/h
|
5827815.99817
in/h
|
150
km/h
|
5906570.26842
in/h
|
152
km/h
|
5985324.53866
in/h
|
154
km/h
|
6064078.80891
in/h
|
156
km/h
|
6142833.07915
in/h
|
158
km/h
|
6221587.3494
in/h
|
160
km/h
|
6300341.61964
in/h
|
162
km/h
|
6379095.88989
in/h
|
164
km/h
|
6457850.16013
in/h
|
166
km/h
|
6536604.43038
in/h
|
168
km/h
|
6615358.70063
in/h
|
170
km/h
|
6694112.97087
in/h
|
172
km/h
|
6772867.24112
in/h
|
174
km/h
|
6851621.51136
in/h
|
176
km/h
|
6930375.78161
in/h
|
178
km/h
|
7009130.05185
in/h
|
180
km/h
|
7087884.3221
in/h
|
182
km/h
|
7166638.59234
in/h
|
184
km/h
|
7245392.86259
in/h
|
186
km/h
|
7324147.13284
in/h
|
188
km/h
|
7402901.40308
in/h
|
190
km/h
|
7481655.67333
in/h
|
192
km/h
|
7560409.94357
in/h
|
194
km/h
|
7639164.21382
in/h
|
196
km/h
|
7717918.48406
in/h
|
198
km/h
|
7796672.75431
in/h
|
200
km/h
|
7875427.02455
in/h
|
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