Convert Planck mass to stone (US)
Please provide values below to convert Planck mass [m_P] to stone (US) [st (US)], or Convert stone (US) to Planck mass.
How to Convert Planck Mass to Stone (Us)
1 m_P = 3.42735356983943e-09 st (US)
Example: convert 15 m_P to st (US):
15 m_P = 15 × 3.42735356983943e-09 st (US) = 5.14103035475915e-08 st (US)
Planck Mass to Stone (Us) Conversion Table
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Planck Mass
The Planck mass (m_P) is a fundamental physical constant representing a mass scale derived from natural units, approximately 2.176 × 10^-8 kilograms.
History/Origin
Introduced by Max Planck in 1899 as part of his system of natural units, the Planck mass emerged from combining fundamental constants to define a universal mass scale in theoretical physics.
Current Use
The Planck mass is primarily used in theoretical physics, especially in quantum gravity and high-energy physics, to express natural units and scale phenomena near the Planck scale.
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.