x unit | 1 xu | 2 xu | 3 xu | 4 xu | 5 xu | 6 xu | 7 xu | 8 xu | 9 xu | 10 xu | 11 xu | 12 xu | 13 xu | 14 xu | 15 xu | 16 xu | 17 xu | 18 xu | 19 xu | 20 xu | 21 xu | 22 xu | 23 xu | 24 xu | 25 xu | 26 xu | 27 xu | 28 xu | 29 xu | 30 xu | 31 xu | 32 xu | 33 xu | 34 xu | 35 xu | 36 xu | 37 xu | 38 xu | 39 xu | 40 xu | 41 xu | 42 xu | 43 xu | 44 xu | 45 xu | 46 xu | 47 xu | 48 xu | 49 xu | 50 xu | 51 xu | 52 xu | 53 xu | 54 xu | 55 xu | 56 xu | 57 xu | 58 xu | 59 xu | 60 xu | 61 xu | 62 xu | 63 xu | 64 xu | 65 xu | 66 xu | 67 xu | 68 xu | 69 xu | 70 xu | 71 xu | 72 xu | 73 xu | 74 xu | 75 xu | 76 xu | 77 xu | 78 xu | 79 xu | 80 xu | 81 xu | 82 xu | 83 xu | 84 xu | 85 xu | 86 xu | 87 xu | 88 xu | 89 xu | 90 xu | 91 xu | 92 xu | 93 xu | 94 xu | 95 xu | 96 xu | 97 xu | 98 xu | 99 xu | 100 xu |
spat | 1.0021 × 10-25 S | 2.0042 × 10-25 S | 3.0063 × 10-25 S | 4.0084 × 10-25 S | 5.0105 × 10-25 S | 6.0126 × 10-25 S | 7.0147 × 10-25 S | 8.0168 × 10-25 S | 9.0189 × 10-25 S | 1.0021 × 10-24 S | 1.10231 × 10-24 S | 1.20252 × 10-24 S | 1.30273 × 10-24 S | 1.40294 × 10-24 S | 1.50315 × 10-24 S | 1.60336 × 10-24 S | 1.70357 × 10-24 S | 1.80378 × 10-24 S | 1.90399 × 10-24 S | 2.0042 × 10-24 S | 2.10441 × 10-24 S | 2.20462 × 10-24 S | 2.30483 × 10-24 S | 2.40504 × 10-24 S | 2.50525 × 10-24 S | 2.60546 × 10-24 S | 2.70567 × 10-24 S | 2.80588 × 10-24 S | 2.90609 × 10-24 S | 3.0063 × 10-24 S | 3.10651 × 10-24 S | 3.20672 × 10-24 S | 3.30693 × 10-24 S | 3.40714 × 10-24 S | 3.50735 × 10-24 S | 3.60756 × 10-24 S | 3.70777 × 10-24 S | 3.80798 × 10-24 S | 3.90819 × 10-24 S | 4.0084 × 10-24 S | 4.10861 × 10-24 S | 4.20882 × 10-24 S | 4.30903 × 10-24 S | 4.40924 × 10-24 S | 4.50945 × 10-24 S | 4.60966 × 10-24 S | 4.70987 × 10-24 S | 4.81008 × 10-24 S | 4.91029 × 10-24 S | 5.0105 × 10-24 S | 5.11071 × 10-24 S | 5.21092 × 10-24 S | 5.31113 × 10-24 S | 5.41134 × 10-24 S | 5.51155 × 10-24 S | 5.61176 × 10-24 S | 5.71197 × 10-24 S | 5.81218 × 10-24 S | 5.91239 × 10-24 S | 6.0126 × 10-24 S | 6.11281 × 10-24 S | 6.21302 × 10-24 S | 6.31323 × 10-24 S | 6.41344 × 10-24 S | 6.51365 × 10-24 S | 6.61386 × 10-24 S | 6.71407 × 10-24 S | 6.81428 × 10-24 S | 6.91449 × 10-24 S | 7.0147 × 10-24 S | 7.11491 × 10-24 S | 7.21512 × 10-24 S | 7.31533 × 10-24 S | 7.41554 × 10-24 S | 7.51575 × 10-24 S | 7.61596 × 10-24 S | 7.71617 × 10-24 S | 7.81638 × 10-24 S | 7.91659 × 10-24 S | 8.0168 × 10-24 S | 8.11701 × 10-24 S | 8.21722 × 10-24 S | 8.31743 × 10-24 S | 8.41764 × 10-24 S | 8.51785 × 10-24 S | 8.61806 × 10-24 S | 8.71827 × 10-24 S | 8.81848 × 10-24 S | 8.91869 × 10-24 S | 9.0189 × 10-24 S | 9.11911 × 10-24 S | 9.21932 × 10-24 S | 9.31953 × 10-24 S | 9.41974 × 10-24 S | 9.51995 × 10-24 S | 9.62016 × 10-24 S | 9.72037 × 10-24 S | 9.82058 × 10-24 S | 9.92079 × 10-24 S | 1.0021 × 10-23 S |
The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
x unit | xu | ≈ 1.0021×10−13 m | ≈ 1.0021×10−13 m | Metric system Non-SI |
x units | spats | x units | spats |
---|---|---|---|
1 | ≈ 1.0021E-25 | 4 | ≈ 4.0084E-25 |
1.5 | ≈ 1.50315E-25 | 4.5 | ≈ 4.50945E-25 |
2 | ≈ 2.0042E-25 | 5 | ≈ 5.0105E-25 |
2.5 | ≈ 2.50525E-25 | 5.5 | ≈ 5.51155E-25 |
3 | ≈ 3.0063E-25 | 6 | ≈ 6.0126E-25 |
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 | x units | spats | x units |
---|---|---|---|
1 | ≈ 9.9790440075841E+24 | 4 | ≈ 3.9916176030336E+25 |
1.5 | ≈ 1.4968566011376E+25 | 4.5 | ≈ 4.4905698034128E+25 |
2 | ≈ 1.9958088015168E+25 | 5 | ≈ 4.989522003792E+25 |
2.5 | ≈ 2.494761001896E+25 | 5.5 | ≈ 5.4884742041712E+25 |
3 | ≈ 2.9937132022752E+25 | 6 | ≈ 5.9874264045504E+25 |
x units | spats |
---|---|
1 | ≈ 1.0021 × 10-25 |
9.9790440075841 × 1024 | ≈ 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 …) |