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The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space ..more definition+
In relation to the base unit of [length] => (meters), 1 Femtometers (fm) is equal to 1.0E-15 meters, while 1 Light Seconds (ls) = 299800000 meters.| 2100 Femtometers | to common length units |
|---|---|
| 2100 fm | = 2.1E-12 meters (m) |
| 2100 fm | = 2.1E-15 kilometers (km) |
| 2100 fm | = 2.1E-10 centimeters (cm) |
| 2100 fm | = 6.8897637795276E-12 feet (ft) |
| 2100 fm | = 8.2677165354331E-11 inches (in) |
| 2100 fm | = 2.2965879265092E-12 yards (yd) |
| 2100 fm | = 1.3048795036984E-15 miles (mi) |
| 2100 fm | = 2.2196385160131E-28 light years (ly) |
| 2100 fm | = 7.9370088739539E-9 pixels (PX) |
| 2100 fm | = 1.3125E+23 planck length (pl) |