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.
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.
Millimeters per hour | Knots |
---|---|
0
mm/h
|
0
knot
|
1000
mm/h
|
0.000539957
knot
|
2000
mm/h
|
0.00107991
knot
|
3000
mm/h
|
0.00161987
knot
|
4000
mm/h
|
0.00215983
knot
|
5000
mm/h
|
0.00269979
knot
|
6000
mm/h
|
0.00323974
knot
|
7000
mm/h
|
0.0037797
knot
|
8000
mm/h
|
0.00431966
knot
|
9000
mm/h
|
0.00485961
knot
|
10000
mm/h
|
0.00539957
knot
|
11000
mm/h
|
0.00593953
knot
|
12000
mm/h
|
0.00647948
knot
|
13000
mm/h
|
0.00701944
knot
|
14000
mm/h
|
0.0075594
knot
|
15000
mm/h
|
0.00809936
knot
|
16000
mm/h
|
0.00863931
knot
|
17000
mm/h
|
0.00917927
knot
|
18000
mm/h
|
0.00971923
knot
|
19000
mm/h
|
0.0102592
knot
|
20000
mm/h
|
0.0107991
knot
|
21000
mm/h
|
0.0113391
knot
|
22000
mm/h
|
0.0118791
knot
|
23000
mm/h
|
0.012419
knot
|
24000
mm/h
|
0.012959
knot
|
25000
mm/h
|
0.0134989
knot
|
26000
mm/h
|
0.0140389
knot
|
27000
mm/h
|
0.0145788
knot
|
28000
mm/h
|
0.0151188
knot
|
29000
mm/h
|
0.0156588
knot
|
30000
mm/h
|
0.0161987
knot
|
31000
mm/h
|
0.0167387
knot
|
32000
mm/h
|
0.0172786
knot
|
33000
mm/h
|
0.0178186
knot
|
34000
mm/h
|
0.0183585
knot
|
35000
mm/h
|
0.0188985
knot
|
36000
mm/h
|
0.0194385
knot
|
37000
mm/h
|
0.0199784
knot
|
38000
mm/h
|
0.0205184
knot
|
39000
mm/h
|
0.0210583
knot
|
40000
mm/h
|
0.0215983
knot
|
41000
mm/h
|
0.0221382
knot
|
42000
mm/h
|
0.0226782
knot
|
43000
mm/h
|
0.0232182
knot
|
44000
mm/h
|
0.0237581
knot
|
45000
mm/h
|
0.0242981
knot
|
46000
mm/h
|
0.024838
knot
|
47000
mm/h
|
0.025378
knot
|
48000
mm/h
|
0.0259179
knot
|
49000
mm/h
|
0.0264579
knot
|
50000
mm/h
|
0.0269979
knot
|
51000
mm/h
|
0.0275378
knot
|
52000
mm/h
|
0.0280778
knot
|
53000
mm/h
|
0.0286177
knot
|
54000
mm/h
|
0.0291577
knot
|
55000
mm/h
|
0.0296976
knot
|
56000
mm/h
|
0.0302376
knot
|
57000
mm/h
|
0.0307775
knot
|
58000
mm/h
|
0.0313175
knot
|
59000
mm/h
|
0.0318575
knot
|
60000
mm/h
|
0.0323974
knot
|
61000
mm/h
|
0.0329374
knot
|
62000
mm/h
|
0.0334773
knot
|
63000
mm/h
|
0.0340173
knot
|
64000
mm/h
|
0.0345572
knot
|
65000
mm/h
|
0.0350972
knot
|
66000
mm/h
|
0.0356372
knot
|
67000
mm/h
|
0.0361771
knot
|
68000
mm/h
|
0.0367171
knot
|
69000
mm/h
|
0.037257
knot
|
70000
mm/h
|
0.037797
knot
|
71000
mm/h
|
0.0383369
knot
|
72000
mm/h
|
0.0388769
knot
|
73000
mm/h
|
0.0394169
knot
|
74000
mm/h
|
0.0399568
knot
|
75000
mm/h
|
0.0404968
knot
|
76000
mm/h
|
0.0410367
knot
|
77000
mm/h
|
0.0415767
knot
|
78000
mm/h
|
0.0421166
knot
|
79000
mm/h
|
0.0426566
knot
|
80000
mm/h
|
0.0431966
knot
|
81000
mm/h
|
0.0437365
knot
|
82000
mm/h
|
0.0442765
knot
|
83000
mm/h
|
0.0448164
knot
|
84000
mm/h
|
0.0453564
knot
|
85000
mm/h
|
0.0458963
knot
|
86000
mm/h
|
0.0464363
knot
|
87000
mm/h
|
0.0469763
knot
|
88000
mm/h
|
0.0475162
knot
|
89000
mm/h
|
0.0480562
knot
|
90000
mm/h
|
0.0485961
knot
|
91000
mm/h
|
0.0491361
knot
|
92000
mm/h
|
0.049676
knot
|
93000
mm/h
|
0.050216
knot
|
94000
mm/h
|
0.050756
knot
|
95000
mm/h
|
0.0512959
knot
|
96000
mm/h
|
0.0518359
knot
|
97000
mm/h
|
0.0523758
knot
|
98000
mm/h
|
0.0529158
knot
|
99000
mm/h
|
0.0534557
knot
|
100000
mm/h
|
0.0539957
knot
|
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