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 inch, once the size of a barleycorn kernel, has fascinating origins. Early English measurement systems based it on the width of a man’s thumb. In the 14th century, King Edward II of England formalized it, defining an inch as the length of three barleycorns laid end to end. Historically, the inch was crucial for countless innovations, especially in Anglo-Saxon countries, influencing everything from watchmaking to industrial design.
Today, the inch still plays an integral role in areas like screen sizes and standardized paper dimensions, delighting both tech enthusiasts and everyday users. Interestingly, in surveying, an inch is divided into hundredths in the US, showing its adaptability in precision tasks. Despite the global shift towards the metric system, the inch endures, showcasing its resilience and continued relevance.
| Millimeters | Inches |
|---|---|
0
mm
|
0
in
|
10
mm
|
0.393701
in
|
20
mm
|
0.787402
in
|
30
mm
|
1.1811
in
|
40
mm
|
1.5748
in
|
50
mm
|
1.9685
in
|
60
mm
|
2.3622
in
|
70
mm
|
2.75591
in
|
80
mm
|
3.14961
in
|
90
mm
|
3.54331
in
|
100
mm
|
3.93701
in
|
110
mm
|
4.33071
in
|
120
mm
|
4.72441
in
|
130
mm
|
5.11811
in
|
140
mm
|
5.51181
in
|
150
mm
|
5.90551
in
|
160
mm
|
6.29921
in
|
170
mm
|
6.69291
in
|
180
mm
|
7.08661
in
|
190
mm
|
7.48032
in
|
200
mm
|
7.87402
in
|
210
mm
|
8.26772
in
|
220
mm
|
8.66142
in
|
230
mm
|
9.05512
in
|
240
mm
|
9.44882
in
|
250
mm
|
9.84252
in
|
260
mm
|
10.23622
in
|
270
mm
|
10.62992
in
|
280
mm
|
11.02362
in
|
290
mm
|
11.41732
in
|
300
mm
|
11.81102
in
|
310
mm
|
12.20472
in
|
320
mm
|
12.59843
in
|
330
mm
|
12.99213
in
|
340
mm
|
13.38583
in
|
350
mm
|
13.77953
in
|
360
mm
|
14.17323
in
|
370
mm
|
14.56693
in
|
380
mm
|
14.96063
in
|
390
mm
|
15.35433
in
|
400
mm
|
15.74803
in
|
410
mm
|
16.14173
in
|
420
mm
|
16.53543
in
|
430
mm
|
16.92913
in
|
440
mm
|
17.32284
in
|
450
mm
|
17.71654
in
|
460
mm
|
18.11024
in
|
470
mm
|
18.50394
in
|
480
mm
|
18.89764
in
|
490
mm
|
19.29134
in
|
500
mm
|
19.68504
in
|
510
mm
|
20.07874
in
|
520
mm
|
20.47244
in
|
530
mm
|
20.86614
in
|
540
mm
|
21.25984
in
|
550
mm
|
21.65354
in
|
560
mm
|
22.04724
in
|
570
mm
|
22.44095
in
|
580
mm
|
22.83465
in
|
590
mm
|
23.22835
in
|
600
mm
|
23.62205
in
|
610
mm
|
24.01575
in
|
620
mm
|
24.40945
in
|
630
mm
|
24.80315
in
|
640
mm
|
25.19685
in
|
650
mm
|
25.59055
in
|
660
mm
|
25.98425
in
|
670
mm
|
26.37795
in
|
680
mm
|
26.77165
in
|
690
mm
|
27.16536
in
|
700
mm
|
27.55906
in
|
710
mm
|
27.95276
in
|
720
mm
|
28.34646
in
|
730
mm
|
28.74016
in
|
740
mm
|
29.13386
in
|
750
mm
|
29.52756
in
|
760
mm
|
29.92126
in
|
770
mm
|
30.31496
in
|
780
mm
|
30.70866
in
|
790
mm
|
31.10236
in
|
800
mm
|
31.49606
in
|
810
mm
|
31.88976
in
|
820
mm
|
32.28347
in
|
830
mm
|
32.67717
in
|
840
mm
|
33.07087
in
|
850
mm
|
33.46457
in
|
860
mm
|
33.85827
in
|
870
mm
|
34.25197
in
|
880
mm
|
34.64567
in
|
890
mm
|
35.03937
in
|
900
mm
|
35.43307
in
|
910
mm
|
35.82677
in
|
920
mm
|
36.22047
in
|
930
mm
|
36.61417
in
|
940
mm
|
37.00788
in
|
950
mm
|
37.40158
in
|
960
mm
|
37.79528
in
|
970
mm
|
38.18898
in
|
980
mm
|
38.58268
in
|
990
mm
|
38.97638
in
|
1000
mm
|
39.37008
in
|
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