Convert Atomic mass unit to stone (US)
Please provide values below to convert Atomic mass unit [u] to stone (US) [st (US)], or Convert stone (US) to Atomic mass unit.
How to Convert Atomic Mass Unit to Stone (Us)
1 u = 2.61490142192144e-28 st (US)
Example: convert 15 u to st (US):
15 u = 15 × 2.61490142192144e-28 st (US) = 3.92235213288215e-27 st (US)
Atomic Mass Unit to Stone (Us) Conversion Table
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Atomic Mass Unit
The atomic mass unit (u) is a standard unit of mass used to express atomic and molecular weights, defined as one twelfth of the mass of a carbon-12 atom.
History/Origin
The atomic mass unit was introduced in the early 20th century to provide a convenient scale for atomic weights. It was originally based on the mass of hydrogen but was later standardized to be one twelfth of the mass of a carbon-12 atom, which was adopted as a reference in 1961 by the IUPAC.
Current Use
The atomic mass unit is widely used in chemistry and physics to express atomic and molecular masses, facilitating calculations in molecular chemistry, nuclear physics, and related fields.
Stone (Us)
A stone (st) is a unit of weight primarily used in the United States, equal to 14 pounds or approximately 6.35 kilograms.
History/Origin
The stone has origins in medieval England, where it was used as a convenient weight measure for trade and commerce. Its value varied regionally before standardization, and it has been used historically for measuring human body weight and other goods.
Current Use
Today, the stone is mainly used in the UK and Ireland for body weight measurement, while in the United States, it is rarely used and often replaced by pounds or kilograms in most contexts.