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.
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.
| Knots | Millimeters per hour |
|---|---|
0
knot
|
0
mm/h
|
1
knot
|
1851999.27898
mm/h
|
2
knot
|
3703998.55795
mm/h
|
3
knot
|
5555997.83693
mm/h
|
4
knot
|
7407997.1159
mm/h
|
5
knot
|
9259996.39488
mm/h
|
6
knot
|
1.1112e+7
mm/h
|
7
knot
|
1.2964e+7
mm/h
|
8
knot
|
1.4816e+7
mm/h
|
9
knot
|
1.6668e+7
mm/h
|
10
knot
|
1.852e+7
mm/h
|
11
knot
|
2.0372e+7
mm/h
|
12
knot
|
2.2224e+7
mm/h
|
13
knot
|
2.4076e+7
mm/h
|
14
knot
|
2.5928e+7
mm/h
|
15
knot
|
2.778e+7
mm/h
|
16
knot
|
2.9632e+7
mm/h
|
17
knot
|
3.1484e+7
mm/h
|
18
knot
|
3.3336e+7
mm/h
|
19
knot
|
3.5188e+7
mm/h
|
20
knot
|
3.704e+7
mm/h
|
21
knot
|
3.8892e+7
mm/h
|
22
knot
|
4.0744e+7
mm/h
|
23
knot
|
4.2596e+7
mm/h
|
24
knot
|
4.4448e+7
mm/h
|
25
knot
|
4.63e+7
mm/h
|
26
knot
|
4.8152e+7
mm/h
|
27
knot
|
5.0004e+7
mm/h
|
28
knot
|
5.1856e+7
mm/h
|
29
knot
|
5.3708e+7
mm/h
|
30
knot
|
5.556e+7
mm/h
|
31
knot
|
5.7412e+7
mm/h
|
32
knot
|
5.9264e+7
mm/h
|
33
knot
|
6.1116e+7
mm/h
|
34
knot
|
6.2968e+7
mm/h
|
35
knot
|
6.482e+7
mm/h
|
36
knot
|
6.6672e+7
mm/h
|
37
knot
|
6.8524e+7
mm/h
|
38
knot
|
7.0376e+7
mm/h
|
39
knot
|
7.2228e+7
mm/h
|
40
knot
|
7.408e+7
mm/h
|
41
knot
|
7.5932e+7
mm/h
|
42
knot
|
7.7784e+7
mm/h
|
43
knot
|
7.9636e+7
mm/h
|
44
knot
|
8.1488e+7
mm/h
|
45
knot
|
8.334e+7
mm/h
|
46
knot
|
8.5192e+7
mm/h
|
47
knot
|
8.7044e+7
mm/h
|
48
knot
|
8.8896e+7
mm/h
|
49
knot
|
9.0748e+7
mm/h
|
50
knot
|
9.26e+7
mm/h
|
51
knot
|
9.4452e+7
mm/h
|
52
knot
|
9.6304e+7
mm/h
|
53
knot
|
9.8156e+7
mm/h
|
54
knot
|
1.00008e+8
mm/h
|
55
knot
|
1.0186e+8
mm/h
|
56
knot
|
1.03712e+8
mm/h
|
57
knot
|
1.05564e+8
mm/h
|
58
knot
|
1.07416e+8
mm/h
|
59
knot
|
1.09268e+8
mm/h
|
60
knot
|
1.1112e+8
mm/h
|
61
knot
|
1.12972e+8
mm/h
|
62
knot
|
1.14824e+8
mm/h
|
63
knot
|
1.16676e+8
mm/h
|
64
knot
|
1.18528e+8
mm/h
|
65
knot
|
1.2038e+8
mm/h
|
66
knot
|
1.22232e+8
mm/h
|
67
knot
|
1.24084e+8
mm/h
|
68
knot
|
1.25936e+8
mm/h
|
69
knot
|
1.27788e+8
mm/h
|
70
knot
|
1.2964e+8
mm/h
|
71
knot
|
1.31492e+8
mm/h
|
72
knot
|
1.33344e+8
mm/h
|
73
knot
|
1.35196e+8
mm/h
|
74
knot
|
1.37048e+8
mm/h
|
75
knot
|
1.389e+8
mm/h
|
76
knot
|
1.40752e+8
mm/h
|
77
knot
|
1.42604e+8
mm/h
|
78
knot
|
1.44456e+8
mm/h
|
79
knot
|
1.46308e+8
mm/h
|
80
knot
|
1.4816e+8
mm/h
|
81
knot
|
1.50012e+8
mm/h
|
82
knot
|
1.51864e+8
mm/h
|
83
knot
|
1.53716e+8
mm/h
|
84
knot
|
1.55568e+8
mm/h
|
85
knot
|
1.5742e+8
mm/h
|
86
knot
|
1.59272e+8
mm/h
|
87
knot
|
1.61124e+8
mm/h
|
88
knot
|
1.62976e+8
mm/h
|
89
knot
|
1.64828e+8
mm/h
|
90
knot
|
1.6668e+8
mm/h
|
91
knot
|
1.68532e+8
mm/h
|
92
knot
|
1.70384e+8
mm/h
|
93
knot
|
1.72236e+8
mm/h
|
94
knot
|
1.74088e+8
mm/h
|
95
knot
|
1.7594e+8
mm/h
|
96
knot
|
1.77792e+8
mm/h
|
97
knot
|
1.79644e+8
mm/h
|
98
knot
|
1.81496e+8
mm/h
|
99
knot
|
1.83348e+8
mm/h
|
100
knot
|
1.852e+8
mm/h
|
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