A prefix meaning one-trillionth (1/1,000,000,000,000 or 10-12)
Example: a picometer is one-trillionth of a meter (in other words, a trillion picometers make 1 meter)
The diameter of a helium atom is about 100 picometers
Symbol is p
Example: 12 pL = 12 picoliters = 12 trillionths of a liter (0.000000000012 L)
