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The picometer (symbol: pm) or picometre (International spelling) is a unit of length in the metric system, equal to 1×10−12 m, or one trillionth (1/1000000000 ..more definition+
The Bohr radius (a0 or rBohr) is a physical constant, approximately equal to the most probable distance between the proton and electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. Its value is 5.2917721067×10^−11 m.
In relation to the base unit of [length] => (meters), 1 Picometers (pm) is equal to 1.0E-12 meters, while 1 Bohr Radius (Bohr) = 5.29177E-11 meters.| 21 Picometers | to common length units |
|---|---|
| 21 pm | = 2.1E-11 meters (m) |
| 21 pm | = 2.1E-14 kilometers (km) |
| 21 pm | = 2.1E-9 centimeters (cm) |
| 21 pm | = 6.8897637795276E-11 feet (ft) |
| 21 pm | = 8.2677165354331E-10 inches (in) |
| 21 pm | = 2.2965879265092E-11 yards (yd) |
| 21 pm | = 1.3048795036984E-14 miles (mi) |
| 21 pm | = 2.2196385160131E-27 light years (ly) |
| 21 pm | = 7.9370088739539E-8 pixels (PX) |
| 21 pm | = 1.3125E+24 planck length (pl) |