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2. Metric prefix - Wikipedia

   en.wikipedia.org/wiki/Metric_prefix

   A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol.

3. Orders of magnitude (mass) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(mass)

   An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe.

4. System of units of measurement - Wikipedia

   en.wikipedia.org/wiki/System_of_units_of_measurement

   At retail stores, the litre (spelled 'liter' in the U.S.) is a commonly used unit for volume, especially on bottles of beverages, and milligrams, rather than grains, are used for medications. Some other non- SI units are still in international use, such as nautical miles and knots in aviation and shipping, and feet for aircraft altitude.

5. Unit prefix - Wikipedia

   en.wikipedia.org/wiki/Unit_prefix

   A unit prefix is a specifier or mnemonic that is added to the beginning of a unit of measurement to indicate multiples or fractions of the units. Units of various sizes are commonly formed by the use of such prefixes.

6. Gram - Wikipedia

   en.wikipedia.org/wiki/Gram

   The gram (originally gramme; [1] SI unit symbol g) is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram.. Originally defined as of 1795 as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre [1 cm 3], and at the temperature of melting ice", [2] the defining temperature (≈0 °C) was later changed to 4 ...

7. Molar mass - Wikipedia

   en.wikipedia.org/wiki/Molar_mass

   The molar mass is appropriate for converting between the mass of a substance and the amount of a substance for bulk quantities. The molecular mass (for molecular compounds) and formula mass (for non-molecular compounds, such as ionic salts ) are commonly used as synonyms of molar mass, differing only in units ( daltons vs g/mol); however, the ...