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.
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.
| Micrometers | US Survey Feet |
|---|---|
0
μm
|
0
ft-us
|
10
μm
|
3.28083e-5
ft-us
|
20
μm
|
6.56167e-5
ft-us
|
30
μm
|
0.000098425
ft-us
|
40
μm
|
0.000131233
ft-us
|
50
μm
|
0.000164042
ft-us
|
60
μm
|
0.00019685
ft-us
|
70
μm
|
0.000229658
ft-us
|
80
μm
|
0.000262467
ft-us
|
90
μm
|
0.000295275
ft-us
|
100
μm
|
0.000328083
ft-us
|
110
μm
|
0.000360892
ft-us
|
120
μm
|
0.0003937
ft-us
|
130
μm
|
0.000426508
ft-us
|
140
μm
|
0.000459317
ft-us
|
150
μm
|
0.000492125
ft-us
|
160
μm
|
0.000524933
ft-us
|
170
μm
|
0.000557742
ft-us
|
180
μm
|
0.00059055
ft-us
|
190
μm
|
0.000623358
ft-us
|
200
μm
|
0.000656167
ft-us
|
210
μm
|
0.000688975
ft-us
|
220
μm
|
0.000721783
ft-us
|
230
μm
|
0.000754592
ft-us
|
240
μm
|
0.0007874
ft-us
|
250
μm
|
0.000820208
ft-us
|
260
μm
|
0.000853017
ft-us
|
270
μm
|
0.000885825
ft-us
|
280
μm
|
0.000918633
ft-us
|
290
μm
|
0.000951442
ft-us
|
300
μm
|
0.00098425
ft-us
|
310
μm
|
0.00101706
ft-us
|
320
μm
|
0.00104987
ft-us
|
330
μm
|
0.00108268
ft-us
|
340
μm
|
0.00111548
ft-us
|
350
μm
|
0.00114829
ft-us
|
360
μm
|
0.0011811
ft-us
|
370
μm
|
0.00121391
ft-us
|
380
μm
|
0.00124672
ft-us
|
390
μm
|
0.00127953
ft-us
|
400
μm
|
0.00131233
ft-us
|
410
μm
|
0.00134514
ft-us
|
420
μm
|
0.00137795
ft-us
|
430
μm
|
0.00141076
ft-us
|
440
μm
|
0.00144357
ft-us
|
450
μm
|
0.00147638
ft-us
|
460
μm
|
0.00150918
ft-us
|
470
μm
|
0.00154199
ft-us
|
480
μm
|
0.0015748
ft-us
|
490
μm
|
0.00160761
ft-us
|
500
μm
|
0.00164042
ft-us
|
510
μm
|
0.00167323
ft-us
|
520
μm
|
0.00170603
ft-us
|
530
μm
|
0.00173884
ft-us
|
540
μm
|
0.00177165
ft-us
|
550
μm
|
0.00180446
ft-us
|
560
μm
|
0.00183727
ft-us
|
570
μm
|
0.00187008
ft-us
|
580
μm
|
0.00190288
ft-us
|
590
μm
|
0.00193569
ft-us
|
600
μm
|
0.0019685
ft-us
|
610
μm
|
0.00200131
ft-us
|
620
μm
|
0.00203412
ft-us
|
630
μm
|
0.00206693
ft-us
|
640
μm
|
0.00209973
ft-us
|
650
μm
|
0.00213254
ft-us
|
660
μm
|
0.00216535
ft-us
|
670
μm
|
0.00219816
ft-us
|
680
μm
|
0.00223097
ft-us
|
690
μm
|
0.00226378
ft-us
|
700
μm
|
0.00229658
ft-us
|
710
μm
|
0.00232939
ft-us
|
720
μm
|
0.0023622
ft-us
|
730
μm
|
0.00239501
ft-us
|
740
μm
|
0.00242782
ft-us
|
750
μm
|
0.00246063
ft-us
|
760
μm
|
0.00249343
ft-us
|
770
μm
|
0.00252624
ft-us
|
780
μm
|
0.00255905
ft-us
|
790
μm
|
0.00259186
ft-us
|
800
μm
|
0.00262467
ft-us
|
810
μm
|
0.00265748
ft-us
|
820
μm
|
0.00269028
ft-us
|
830
μm
|
0.00272309
ft-us
|
840
μm
|
0.0027559
ft-us
|
850
μm
|
0.00278871
ft-us
|
860
μm
|
0.00282152
ft-us
|
870
μm
|
0.00285433
ft-us
|
880
μm
|
0.00288713
ft-us
|
890
μm
|
0.00291994
ft-us
|
900
μm
|
0.00295275
ft-us
|
910
μm
|
0.00298556
ft-us
|
920
μm
|
0.00301837
ft-us
|
930
μm
|
0.00305118
ft-us
|
940
μm
|
0.00308398
ft-us
|
950
μm
|
0.00311679
ft-us
|
960
μm
|
0.0031496
ft-us
|
970
μm
|
0.00318241
ft-us
|
980
μm
|
0.00321522
ft-us
|
990
μm
|
0.00324803
ft-us
|
1000
μm
|
0.00328083
ft-us
|
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