In the metric system, a microgram is 1/1,000,000 of a gram, or 1/1000 of a milligram, is one of the smallest units of weight/mass commonly used. The abbreviation μg is often used in scientific literature, but JCAHO recommends that hospitals do not use this abbreviation in handwritten orders due to the risk that the mu could be mistaken for an m, resulting in a thousandfold overdose. The abbreviation mcg is recommended instead.[1] The International System of Units (symbol: SI) (for the French phrase Syst me International dUnit s) is the most widely used system of units. ... BIC pen cap, about 1 gram. ... The Joint Commission on Accreditation of Healthcare Organizations (JCAHO) is a US based non-profit organization formed in 1951 with a mission to maintain and elevate the standards of healthcare delivery through evaluation and accreditation of healthcare organizations. ... Look up Îœ, μ in Wiktionary, the free dictionary. ...
By definition, the error in the repeatability of the current definition is exactly zero; however, in the usual sense of the word, it can be regarded as of the order of 2 micrograms.
This is found by comparing the official standard with its official copies, which are made of roughly the same materials and kept under the same conditions.
The international prototype of the kilogram seems to have lost about 50 micrograms in the last 100 years, and the reason for the loss is still unknown (reported in Der Spiegel, 2003 #26).
Microgram's release was mostly unnoticed, and its reception has been subdued--so subdued that even the chemical underground, where people in years past might have found in the newsletter a wealth of knowledge about how to synthesize and distribute psychoactive substances, has hardly noticed it.
When it started back in 1967, Microgram was a few typewritten pages in which chemists shared lab techniques for analyzing and identifying the drugs that were showing up on the street.
Microgram tells the fate of cocaine dissolved in canned liquids, embedded in the linings of plastic mugs, impregnated in a clear silicone caulk, and packed into decorative wooden globes, lotion bottles, candles, and pictures.
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