The knot, a unit of speed equal to one nautical mile per hour, has its origins in the age of sail. Mariners used a device known as the “common log” to measure a ship’s speed. This involved a wooden log attached to a rope with knots tied at uniform intervals. By counting the knots that passed through a sailor’s hands over a set period, they could determine the ship’s speed. Today, knots remain an essential measure in aviation and maritime contexts, underscoring how deeply it is embedded in navigation traditions.
Interestingly, the nautical mile, corresponding to one minute of latitude, is roughly 1.1508 miles. This makes the knot not only a unique unit for speed but also a reminder of the Earth’s curvature and ancient navigation skills.
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.
| Knots | Inches per hour |
|---|---|
0
knot
|
0
in/h
|
1
knot
|
72926.42586
in/h
|
2
knot
|
145852.85171
in/h
|
3
knot
|
218779.27757
in/h
|
4
knot
|
291705.70342
in/h
|
5
knot
|
364632.12928
in/h
|
6
knot
|
437558.55513
in/h
|
7
knot
|
510484.98099
in/h
|
8
knot
|
583411.40684
in/h
|
9
knot
|
656337.8327
in/h
|
10
knot
|
729264.25856
in/h
|
11
knot
|
802190.68441
in/h
|
12
knot
|
875117.11027
in/h
|
13
knot
|
948043.53612
in/h
|
14
knot
|
1020969.96198
in/h
|
15
knot
|
1093896.38783
in/h
|
16
knot
|
1166822.81369
in/h
|
17
knot
|
1239749.23954
in/h
|
18
knot
|
1312675.6654
in/h
|
19
knot
|
1385602.09125
in/h
|
20
knot
|
1458528.51711
in/h
|
21
knot
|
1531454.94297
in/h
|
22
knot
|
1604381.36882
in/h
|
23
knot
|
1677307.79468
in/h
|
24
knot
|
1750234.22053
in/h
|
25
knot
|
1823160.64639
in/h
|
26
knot
|
1896087.07224
in/h
|
27
knot
|
1969013.4981
in/h
|
28
knot
|
2041939.92395
in/h
|
29
knot
|
2114866.34981
in/h
|
30
knot
|
2187792.77567
in/h
|
31
knot
|
2260719.20152
in/h
|
32
knot
|
2333645.62738
in/h
|
33
knot
|
2406572.05323
in/h
|
34
knot
|
2479498.47909
in/h
|
35
knot
|
2552424.90494
in/h
|
36
knot
|
2625351.3308
in/h
|
37
knot
|
2698277.75665
in/h
|
38
knot
|
2771204.18251
in/h
|
39
knot
|
2844130.60837
in/h
|
40
knot
|
2917057.03422
in/h
|
41
knot
|
2989983.46008
in/h
|
42
knot
|
3062909.88593
in/h
|
43
knot
|
3135836.31179
in/h
|
44
knot
|
3208762.73764
in/h
|
45
knot
|
3281689.1635
in/h
|
46
knot
|
3354615.58935
in/h
|
47
knot
|
3427542.01521
in/h
|
48
knot
|
3500468.44106
in/h
|
49
knot
|
3573394.86692
in/h
|
50
knot
|
3646321.29278
in/h
|
51
knot
|
3719247.71863
in/h
|
52
knot
|
3792174.14449
in/h
|
53
knot
|
3865100.57034
in/h
|
54
knot
|
3938026.9962
in/h
|
55
knot
|
4010953.42205
in/h
|
56
knot
|
4083879.84791
in/h
|
57
knot
|
4156806.27376
in/h
|
58
knot
|
4229732.69962
in/h
|
59
knot
|
4302659.12548
in/h
|
60
knot
|
4375585.55133
in/h
|
61
knot
|
4448511.97719
in/h
|
62
knot
|
4521438.40304
in/h
|
63
knot
|
4594364.8289
in/h
|
64
knot
|
4667291.25475
in/h
|
65
knot
|
4740217.68061
in/h
|
66
knot
|
4813144.10646
in/h
|
67
knot
|
4886070.53232
in/h
|
68
knot
|
4958996.95817
in/h
|
69
knot
|
5031923.38403
in/h
|
70
knot
|
5104849.80989
in/h
|
71
knot
|
5177776.23574
in/h
|
72
knot
|
5250702.6616
in/h
|
73
knot
|
5323629.08745
in/h
|
74
knot
|
5396555.51331
in/h
|
75
knot
|
5469481.93916
in/h
|
76
knot
|
5542408.36502
in/h
|
77
knot
|
5615334.79087
in/h
|
78
knot
|
5688261.21673
in/h
|
79
knot
|
5761187.64259
in/h
|
80
knot
|
5834114.06844
in/h
|
81
knot
|
5907040.4943
in/h
|
82
knot
|
5979966.92015
in/h
|
83
knot
|
6052893.34601
in/h
|
84
knot
|
6125819.77186
in/h
|
85
knot
|
6198746.19772
in/h
|
86
knot
|
6271672.62357
in/h
|
87
knot
|
6344599.04943
in/h
|
88
knot
|
6417525.47529
in/h
|
89
knot
|
6490451.90114
in/h
|
90
knot
|
6563378.327
in/h
|
91
knot
|
6636304.75285
in/h
|
92
knot
|
6709231.17871
in/h
|
93
knot
|
6782157.60456
in/h
|
94
knot
|
6855084.03042
in/h
|
95
knot
|
6928010.45627
in/h
|
96
knot
|
7000936.88213
in/h
|
97
knot
|
7073863.30798
in/h
|
98
knot
|
7146789.73384
in/h
|
99
knot
|
7219716.1597
in/h
|
100
knot
|
7292642.58555
in/h
|
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