The US Survey Foot might seem like an unassuming unit, but it’s steeped in the very history of American land measurement. Unlike the International Foot, which is precisely defined as 0.3048 meters, the US Survey Foot is ever-so-slightly longer at approximately 0.3048006 meters. This minuscule difference stems from surveying practices established in the early 19th century and has historically been used for mapping and property delineation across the United States. Integral to the country’s westward expansion, the US Survey Foot played a pivotal role in the division and sale of public lands—underscoring its foundational impact on both real estate and infrastructure.
Despite its historical significance, the US Survey Foot was officially deprecated at the end of 2022, as the US moves towards a unified use of the International Foot for federal geodetic surveys. This transition simplifies engineering and scientific calculations, streamlining US standards with global practices. The legacy of the US Survey Foot, however, serves as a fascinating footnote in the story of American land development, marking an era when precise measurements charted the course of a growing nation.
The micrometer, often referred to as a “micron,” is an incredibly small unit of measurement in the metric system, equal to one-millionth of a meter. It’s fascinating to realize that even though micrometers are invisible to the naked eye, they are pivotal in fields like microbiology and nanotechnology. For instance, the average human hair is about 70 to 100 micrometers thick, putting into perspective just how minuscule this unit is.
Moreover, precision engineering heavily relies on micrometer measurements to create components for electronics and watchmaking, where even the slightest deviation can lead to a malfunction. The ability to measure such tiny dimensions has revolutionized industries, enabling the production of finely-tuned machinery and advancing scientific research at a molecular level.
| US Survey Feet | Micrometers |
|---|---|
0
ft-us
|
0
μm
|
1
ft-us
|
304800.59985
μm
|
2
ft-us
|
609601.19969
μm
|
3
ft-us
|
914401.79954
μm
|
4
ft-us
|
1219202.39939
μm
|
5
ft-us
|
1524003
μm
|
6
ft-us
|
1828803.59908
μm
|
7
ft-us
|
2133604.19892
μm
|
8
ft-us
|
2438404.79877
μm
|
9
ft-us
|
2743205.39862
μm
|
10
ft-us
|
3048005.99846
μm
|
11
ft-us
|
3352806.59831
μm
|
12
ft-us
|
3657607.19816
μm
|
13
ft-us
|
3962407.798
μm
|
14
ft-us
|
4267208.39785
μm
|
15
ft-us
|
4572008.9977
μm
|
16
ft-us
|
4876809.59754
μm
|
17
ft-us
|
5181610.19739
μm
|
18
ft-us
|
5486410.79723
μm
|
19
ft-us
|
5791211.39708
μm
|
20
ft-us
|
6096011.99693
μm
|
21
ft-us
|
6400812.59677
μm
|
22
ft-us
|
6705613.19662
μm
|
23
ft-us
|
7010413.79647
μm
|
24
ft-us
|
7315214.39631
μm
|
25
ft-us
|
7620014.99616
μm
|
26
ft-us
|
7924815.59601
μm
|
27
ft-us
|
8229616.19585
μm
|
28
ft-us
|
8534416.7957
μm
|
29
ft-us
|
8839217.39555
μm
|
30
ft-us
|
9144017.99539
μm
|
31
ft-us
|
9448818.59524
μm
|
32
ft-us
|
9753619.19508
μm
|
33
ft-us
|
1.00584e+7
μm
|
34
ft-us
|
1.03632e+7
μm
|
35
ft-us
|
1.0668e+7
μm
|
36
ft-us
|
1.09728e+7
μm
|
37
ft-us
|
1.12776e+7
μm
|
38
ft-us
|
1.15824e+7
μm
|
39
ft-us
|
1.18872e+7
μm
|
40
ft-us
|
1.2192e+7
μm
|
41
ft-us
|
1.24968e+7
μm
|
42
ft-us
|
1.28016e+7
μm
|
43
ft-us
|
1.31064e+7
μm
|
44
ft-us
|
1.34112e+7
μm
|
45
ft-us
|
1.3716e+7
μm
|
46
ft-us
|
1.40208e+7
μm
|
47
ft-us
|
1.43256e+7
μm
|
48
ft-us
|
1.46304e+7
μm
|
49
ft-us
|
1.49352e+7
μm
|
50
ft-us
|
1.524e+7
μm
|
51
ft-us
|
1.55448e+7
μm
|
52
ft-us
|
1.58496e+7
μm
|
53
ft-us
|
1.61544e+7
μm
|
54
ft-us
|
1.64592e+7
μm
|
55
ft-us
|
1.6764e+7
μm
|
56
ft-us
|
1.70688e+7
μm
|
57
ft-us
|
1.73736e+7
μm
|
58
ft-us
|
1.76784e+7
μm
|
59
ft-us
|
1.79832e+7
μm
|
60
ft-us
|
1.8288e+7
μm
|
61
ft-us
|
1.85928e+7
μm
|
62
ft-us
|
1.88976e+7
μm
|
63
ft-us
|
1.92024e+7
μm
|
64
ft-us
|
1.95072e+7
μm
|
65
ft-us
|
1.9812e+7
μm
|
66
ft-us
|
2.01168e+7
μm
|
67
ft-us
|
2.04216e+7
μm
|
68
ft-us
|
2.07264e+7
μm
|
69
ft-us
|
2.10312e+7
μm
|
70
ft-us
|
2.1336e+7
μm
|
71
ft-us
|
2.16408e+7
μm
|
72
ft-us
|
2.19456e+7
μm
|
73
ft-us
|
2.22504e+7
μm
|
74
ft-us
|
2.25552e+7
μm
|
75
ft-us
|
2.286e+7
μm
|
76
ft-us
|
2.31648e+7
μm
|
77
ft-us
|
2.34696e+7
μm
|
78
ft-us
|
2.37744e+7
μm
|
79
ft-us
|
2.40792e+7
μm
|
80
ft-us
|
2.4384e+7
μm
|
81
ft-us
|
2.46888e+7
μm
|
82
ft-us
|
2.49936e+7
μm
|
83
ft-us
|
2.52984e+7
μm
|
84
ft-us
|
2.56033e+7
μm
|
85
ft-us
|
2.59081e+7
μm
|
86
ft-us
|
2.62129e+7
μm
|
87
ft-us
|
2.65177e+7
μm
|
88
ft-us
|
2.68225e+7
μm
|
89
ft-us
|
2.71273e+7
μm
|
90
ft-us
|
2.74321e+7
μm
|
91
ft-us
|
2.77369e+7
μm
|
92
ft-us
|
2.80417e+7
μm
|
93
ft-us
|
2.83465e+7
μm
|
94
ft-us
|
2.86513e+7
μm
|
95
ft-us
|
2.89561e+7
μm
|
96
ft-us
|
2.92609e+7
μm
|
97
ft-us
|
2.95657e+7
μm
|
98
ft-us
|
2.98705e+7
μm
|
99
ft-us
|
3.01753e+7
μm
|
100
ft-us
|
3.04801e+7
μm
|
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