Planck mass facts for kids
The Planck mass is a small unit of mass used in physics. It is derived using an equation involving Planck's constant, the speed of light in a vacuum, and the gravitational constant. It is approximately 21.76 μg, which is about the mass of a grain of rice.
The idea was to have a definition based only on fundamental universal constants.
See also
In Spanish: Unidades de Planck para niños
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Planck mass Facts for Kids. Kiddle Encyclopedia.