Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A unit of mass equal to one thousandth (10−3) of a milligram or one millionth (10−6) of a gram.
from The Century Dictionary.
- noun The millionth part of a gram, being about of a grain troy.
- noun A photograph or a drawing of a microscopic object.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A unit of
mass equal to 0.000 001grams . Symbol:μg ormcg
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun one millionth (1/1,000,000) gram
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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It takes 1000 grams to make a kilogram, so that means a microgram is a billionth of a kilogram.
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Each dose contains 50 micrograms (a microgram is one-millionth of a gram and a gram is the weight of one-fifth of a teaspoon of water).
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A microgram is a millionth of a gram; a deciliter is one-tenth of a liter.
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Section VI of the proposal covers the challenges and risks to laser weapons ... mainly that of cheaply producing large quantities of Polonium-210 (currently produced only in microgram quantities, and extremely lethal).
Boing Boing 2006
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In the most recent studies, lead was not detectable in most foods and the average dietary intake of lead was about 1 microgram (a microgram is a millionth of a gram) per kilogram of body weight/day.
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In the years 1986 to 1991, the average adult in the United States consumed an average of 0.8 micrograms (a microgram is a millionth of a gram) of DDT a day.
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Now, the point about polonium is of course that we need, as you just said, very tiny amounts, a microgram, which is a millionth of gram, of polonium will do terrible damage to you once inside your body.
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In the most recent studies, lead was not detectable in most foods and the average dietary intake of lead was about 1 microgram (a microgram is a millionth of a gram) per kilogram of body weight/day.
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Since some xenobiotics are toxic in much smaller quantities than the milligram, smaller fractions of the gram are used, such as microgram (µg).
Dose 2008
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The Federal Safe Drinking Water Act standards have a drinking water criteria for total mercury at 2 ppb or 2 microgram per liter (ug/L).
Waldo Jaquith - A new study says mercury is commonly found in corn syrup. 2009
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