micrometer | 1 μm | 2 μm | 3 μm | 4 μm | 5 μm | 6 μm | 7 μm | 8 μm | 9 μm | 10 μm | 11 μm | 12 μm | 13 μm | 14 μm | 15 μm | 16 μm | 17 μm | 18 μm | 19 μm | 20 μm | 21 μm | 22 μm | 23 μm | 24 μm | 25 μm | 26 μm | 27 μm | 28 μm | 29 μm | 30 μm | 31 μm | 32 μm | 33 μm | 34 μm | 35 μm | 36 μm | 37 μm | 38 μm | 39 μm | 40 μm | 41 μm | 42 μm | 43 μm | 44 μm | 45 μm | 46 μm | 47 μm | 48 μm | 49 μm | 50 μm | 51 μm | 52 μm | 53 μm | 54 μm | 55 μm | 56 μm | 57 μm | 58 μm | 59 μm | 60 μm | 61 μm | 62 μm | 63 μm | 64 μm | 65 μm | 66 μm | 67 μm | 68 μm | 69 μm | 70 μm | 71 μm | 72 μm | 73 μm | 74 μm | 75 μm | 76 μm | 77 μm | 78 μm | 79 μm | 80 μm | 81 μm | 82 μm | 83 μm | 84 μm | 85 μm | 86 μm | 87 μm | 88 μm | 89 μm | 90 μm | 91 μm | 92 μm | 93 μm | 94 μm | 95 μm | 96 μm | 97 μm | 98 μm | 99 μm | 100 μm |
spat | 1.0 × 10-18 S | 2.0 × 10-18 S | 3.0 × 10-18 S | 4.0 × 10-18 S | 5.0 × 10-18 S | 6.0 × 10-18 S | 7.0 × 10-18 S | 8.0 × 10-18 S | 9.0 × 10-18 S | 1.0 × 10-17 S | 1.1 × 10-17 S | 1.2 × 10-17 S | 1.3 × 10-17 S | 1.4 × 10-17 S | 1.5 × 10-17 S | 1.6 × 10-17 S | 1.7 × 10-17 S | 1.8 × 10-17 S | 1.9 × 10-17 S | 2.0 × 10-17 S | 2.1 × 10-17 S | 2.2 × 10-17 S | 2.3 × 10-17 S | 2.4 × 10-17 S | 2.5 × 10-17 S | 2.6 × 10-17 S | 2.7 × 10-17 S | 2.8 × 10-17 S | 2.9 × 10-17 S | 3.0 × 10-17 S | 3.1 × 10-17 S | 3.2 × 10-17 S | 3.3 × 10-17 S | 3.4 × 10-17 S | 3.5 × 10-17 S | 3.6 × 10-17 S | 3.7 × 10-17 S | 3.8 × 10-17 S | 3.9 × 10-17 S | 4.0 × 10-17 S | 4.1 × 10-17 S | 4.2 × 10-17 S | 4.3 × 10-17 S | 4.4 × 10-17 S | 4.5 × 10-17 S | 4.6 × 10-17 S | 4.7 × 10-17 S | 4.8 × 10-17 S | 4.9 × 10-17 S | 5.0 × 10-17 S | 5.1 × 10-17 S | 5.2 × 10-17 S | 5.3 × 10-17 S | 5.4 × 10-17 S | 5.5 × 10-17 S | 5.6 × 10-17 S | 5.7 × 10-17 S | 5.8 × 10-17 S | 5.9 × 10-17 S | 6.0 × 10-17 S | 6.1 × 10-17 S | 6.2 × 10-17 S | 6.3 × 10-17 S | 6.4 × 10-17 S | 6.5 × 10-17 S | 6.6 × 10-17 S | 6.7 × 10-17 S | 6.8 × 10-17 S | 6.9 × 10-17 S | 7.0 × 10-17 S | 7.1 × 10-17 S | 7.2 × 10-17 S | 7.3 × 10-17 S | 7.4 × 10-17 S | 7.5 × 10-17 S | 7.6 × 10-17 S | 7.7 × 10-17 S | 7.8 × 10-17 S | 7.9 × 10-17 S | 8.0 × 10-17 S | 8.1 × 10-17 S | 8.2 × 10-17 S | 8.3 × 10-17 S | 8.4 × 10-17 S | 8.5 × 10-17 S | 8.6 × 10-17 S | 8.7 × 10-17 S | 8.8 × 10-17 S | 8.9 × 10-17 S | 9.0 × 10-17 S | 9.1 × 10-17 S | 9.2 × 10-17 S | 9.3 × 10-17 S | 9.4 × 10-17 S | 9.5 × 10-17 S | 9.6 × 10-17 S | 9.7 × 10-17 S | 9.8 × 10-17 S | 9.9 × 10-17 S | 1.0 × 10-16 S |
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
micrometer | μm | ≡ 1×10-6 m | ≡ 1×10-6 m | Metric system SI |
micrometers | spats | micrometers | spats |
---|---|---|---|
1 | ≡ 1.0E-18 | 4 | ≡ 4.0E-18 |
1.5 | ≡ 1.5E-18 | 4.5 | ≡ 4.5E-18 |
2 | ≡ 2.0E-18 | 5 | ≡ 5.0E-18 |
2.5 | ≡ 2.5E-18 | 5.5 | ≡ 5.5E-18 |
3 | ≡ 3.0E-18 | 6 | ≡ 6.0E-18 |
The spat (symbol S) is also an obsolete unit of distance used in astronomy. It is equal to 1000000000 kilometres (1 Tm or 1012 m). It is about 6.6846 astronomical units (AU), 1.057×10−4 light-years or3.240×10−5 parsecs.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
spat | S | ≡ 1×1012 m | ≡ 1×1012 m | Science - Astronomy (Length) |
spats | micrometers | spats | micrometers |
---|---|---|---|
1 | ≡ 1.0E+18 | 4 | ≡ 4.0E+18 |
1.5 | ≡ 1.5E+18 | 4.5 | ≡ 4.5E+18 |
2 | ≡ 2.0E+18 | 5 | ≡ 5.0E+18 |
2.5 | ≡ 2.5E+18 | 5.5 | ≡ 5.5E+18 |
3 | ≡ 3.0E+18 | 6 | ≡ 6.0E+18 |
micrometers | spats |
---|---|
1 | ≡ 1.0 × 10-18 |
1.0 × 1018 | ≡ 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |