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Planck length
In
physics
, the
Planck length
, denoted , is a unit of
length
, equal to
metres
. It is a
base unit
in the system of
Planck units
, developed by physicist
Max Planck
. The Planck length can be defined from three
fundamental physical constants
: the
speed of light
in a vacuum, the
Planck constant
, and the
gravitational constant
.
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