What is picogram?

Picogram is a unit of measurement of mass, which is equal to one trillionth (10^-12) of a gram. It is commonly used in the sciences, particularly in the fields of chemistry, biology, and physics, to measure very small quantities of substances such as molecules, ions, and proteins. The symbol for picogram is pg. One picogram is equivalent to 0.001 nanograms or 0.000000001 grams. It is often used in conjunction with other prefixes such as milli-, micro-, and nano- to express even smaller quantities.