The millimeter, a unit of length in the metric system, is commonly used to measure small dimensions with remarkable precision. Its significance is often seen in fields requiring meticulous attention to detail, like engineering and manufacturing. Interestingly, the human hair’s average diameter ranges between 70 to 100 micrometers, making the millimeter about 10 to 15 times larger. This highlights the millimeter’s role in bridging the gap between microscopic measurements and the macroscopic world.
Moreover, the millimeter plays a critical role in rainfall measurements, as meteorologists use it to report precipitation levels. One millimeter of rain translates to a liter of water per square meter, directly impacting environmental assessments and agricultural planning. Its ubiquitous presence in both science and daily life underscores its versatility and importance.
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.
| Millimeters | US Survey Feet |
|---|---|
0
mm
|
0
ft-us
|
10
mm
|
0.0328083
ft-us
|
20
mm
|
0.0656167
ft-us
|
30
mm
|
0.098425
ft-us
|
40
mm
|
0.131233
ft-us
|
50
mm
|
0.164042
ft-us
|
60
mm
|
0.19685
ft-us
|
70
mm
|
0.229658
ft-us
|
80
mm
|
0.262467
ft-us
|
90
mm
|
0.295275
ft-us
|
100
mm
|
0.328083
ft-us
|
110
mm
|
0.360892
ft-us
|
120
mm
|
0.3937
ft-us
|
130
mm
|
0.426508
ft-us
|
140
mm
|
0.459317
ft-us
|
150
mm
|
0.492125
ft-us
|
160
mm
|
0.524933
ft-us
|
170
mm
|
0.557742
ft-us
|
180
mm
|
0.59055
ft-us
|
190
mm
|
0.623358
ft-us
|
200
mm
|
0.656167
ft-us
|
210
mm
|
0.688975
ft-us
|
220
mm
|
0.721783
ft-us
|
230
mm
|
0.754592
ft-us
|
240
mm
|
0.7874
ft-us
|
250
mm
|
0.820208
ft-us
|
260
mm
|
0.853017
ft-us
|
270
mm
|
0.885825
ft-us
|
280
mm
|
0.918633
ft-us
|
290
mm
|
0.951442
ft-us
|
300
mm
|
0.98425
ft-us
|
310
mm
|
1.01706
ft-us
|
320
mm
|
1.04987
ft-us
|
330
mm
|
1.08268
ft-us
|
340
mm
|
1.11548
ft-us
|
350
mm
|
1.14829
ft-us
|
360
mm
|
1.1811
ft-us
|
370
mm
|
1.21391
ft-us
|
380
mm
|
1.24672
ft-us
|
390
mm
|
1.27953
ft-us
|
400
mm
|
1.31233
ft-us
|
410
mm
|
1.34514
ft-us
|
420
mm
|
1.37795
ft-us
|
430
mm
|
1.41076
ft-us
|
440
mm
|
1.44357
ft-us
|
450
mm
|
1.47638
ft-us
|
460
mm
|
1.50918
ft-us
|
470
mm
|
1.54199
ft-us
|
480
mm
|
1.5748
ft-us
|
490
mm
|
1.60761
ft-us
|
500
mm
|
1.64042
ft-us
|
510
mm
|
1.67323
ft-us
|
520
mm
|
1.70603
ft-us
|
530
mm
|
1.73884
ft-us
|
540
mm
|
1.77165
ft-us
|
550
mm
|
1.80446
ft-us
|
560
mm
|
1.83727
ft-us
|
570
mm
|
1.87008
ft-us
|
580
mm
|
1.90288
ft-us
|
590
mm
|
1.93569
ft-us
|
600
mm
|
1.9685
ft-us
|
610
mm
|
2.00131
ft-us
|
620
mm
|
2.03412
ft-us
|
630
mm
|
2.06693
ft-us
|
640
mm
|
2.09973
ft-us
|
650
mm
|
2.13254
ft-us
|
660
mm
|
2.16535
ft-us
|
670
mm
|
2.19816
ft-us
|
680
mm
|
2.23097
ft-us
|
690
mm
|
2.26378
ft-us
|
700
mm
|
2.29658
ft-us
|
710
mm
|
2.32939
ft-us
|
720
mm
|
2.3622
ft-us
|
730
mm
|
2.39501
ft-us
|
740
mm
|
2.42782
ft-us
|
750
mm
|
2.46063
ft-us
|
760
mm
|
2.49343
ft-us
|
770
mm
|
2.52624
ft-us
|
780
mm
|
2.55905
ft-us
|
790
mm
|
2.59186
ft-us
|
800
mm
|
2.62467
ft-us
|
810
mm
|
2.65748
ft-us
|
820
mm
|
2.69028
ft-us
|
830
mm
|
2.72309
ft-us
|
840
mm
|
2.7559
ft-us
|
850
mm
|
2.78871
ft-us
|
860
mm
|
2.82152
ft-us
|
870
mm
|
2.85433
ft-us
|
880
mm
|
2.88713
ft-us
|
890
mm
|
2.91994
ft-us
|
900
mm
|
2.95275
ft-us
|
910
mm
|
2.98556
ft-us
|
920
mm
|
3.01837
ft-us
|
930
mm
|
3.05118
ft-us
|
940
mm
|
3.08398
ft-us
|
950
mm
|
3.11679
ft-us
|
960
mm
|
3.1496
ft-us
|
970
mm
|
3.18241
ft-us
|
980
mm
|
3.21522
ft-us
|
990
mm
|
3.24803
ft-us
|
1000
mm
|
3.28083
ft-us
|
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