The unit centigram is rarely used. Engineers and scientists like to use powers of thousand (powers of ten in which the exponent is a multiple of 3), so either grams or milligrams would normally be used.
An object between about a millimeter and a centimeter in diameter can be expected to have a mass of more than a milligram, but less than a gram (it really depends on the shape and the density, though). Amounts of trace substances in food are sometimes expressed in milligrams, or even micrograms.
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