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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.
The siriometer is a rarely used and an obsolete astronomical unit of length, defined to be equal to about one million astronomical units (au). One siriometer is approxim ..more definition+
In relation to the base unit of [length] => (meters), 1 X Unit (xu) is equal to 1.002004E-13 meters, while 1 Siriometer (sir) = 1.496E+17 meters.| 81 X Unit | to common length units |
|---|---|
| 81 xu | = 8.1162324E-12 meters (m) |
| 81 xu | = 8.1162324E-15 kilometers (km) |
| 81 xu | = 8.1162324E-10 centimeters (cm) |
| 81 xu | = 2.6628059055118E-11 feet (ft) |
| 81 xu | = 3.1953670866142E-10 inches (in) |
| 81 xu | = 8.8760196850394E-12 yards (yd) |
| 81 xu | = 5.0431930028633E-15 miles (mi) |
| 81 xu | = 8.5786200190255E-28 light years (ly) |
| 81 xu | = 3.0675527896129E-8 pixels (PX) |
| 81 xu | = 5.07264525E+23 planck length (pl) |