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What do letters stand for in mathematics?
Length unit:

Light years, meters (Pm), megameters (Mm), kilometers (km), meters (m), decimeters (dm), centimeters (cm), millimeters (mm), silk rice (dmm), millet (cmm), micron (micron), nanometer (nm) and so on.

Time unit:

Hours (h), minutes (min), seconds (s), milliseconds (ms), microseconds (? United States)

Nanosecond (ns), picosecond (ps), femtosecond (fs)

Weight units: tons (t), kilograms (kg), grams (g) and milligrams.

Microgram, mass unit, symbol μg (English: Microgram).

1 microgram is equal to one millionth of a gram (10-6 grams).

1 0,000 μ g = 1 mg

1 1,000,000 μ g = 1 g

1 000,000,000 μ g = 1 kg

The unit of mass is one thousandth of a gram.

1 mg = 1 000 micrograms.

1 000 mg = 1 g.

1 000 000 mg = 1 kg

The symbol g is equal to one thousandth of a kilogram. The weight of one gram is equivalent to the weight of one cubic centimeter of water at room temperature, which is equivalent to the mass of a cross clamp.

1 ton = 1, 000,000 grams

1 kg = 1 1,000 g

1 mg = 0.00 1 g.

1 μ g = 0.000 00 1

Kilogram, also known as kilogram, is an international basic unit of mass, with the symbol kg.