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A span is the distance measured by a human hand, from the tip of the thumb to the tip of the little finger. In ancient times, a span was considered to be half a cubit. Someti ..more definition+
In relation to the base unit of [length] => (meters), 1 Petameters (Pm) is equal to 1000000000000000 meters, while 1 Spans (span) = 0.2286 meters.| 21 Petameters | to common length units |
|---|---|
| 21 Pm | = 21000000000000000 meters (m) |
| 21 Pm | = 21000000000000 kilometers (km) |
| 21 Pm | = 2.1E+18 centimeters (cm) |
| 21 Pm | = 6.8897637795276E+16 feet (ft) |
| 21 Pm | = 8.2677165354331E+17 inches (in) |
| 21 Pm | = 2.2965879265092E+16 yards (yd) |
| 21 Pm | = 13048795036984 miles (mi) |
| 21 Pm | = 2.2196385160131 light years (ly) |
| 21 Pm | = 7.9370088739539E+19 pixels (PX) |
| 21 Pm | = 1.3125E+51 planck length (pl) |