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1 kg wt. = 1,000,000.00 µg / mcg
1 µg / mcg = 0.000001 kg wt.
Definition of kilograms of water provided by WikiPedia
The kilogram or kilogramme (SI unit symbol: kg), is the base unit of mass in the International System of Units (SI) (the Metric system) and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK).
Definition of micro-gram of water provided by SMARTe.org
Concentrations of chemicals in water are typically measured in units of the mass of chemical (milligrams, mg or micrograms, ug) per volume of water (liter, L, l).