Last Updated
：2025/11/25
Planck length
Noun
Japanese Meaning
プランク長：物理学で用いられる長さの単位。光速、万有引力定数、換算プランク定数を用いて定義され、物理的意味を持つ最小の長さと考えられている。
（ plural ）
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(physics) A unit of length, believed to be the smallest length that has physical meaning, that is defined in terms of the speed of light, the gravitational constant and the reduced Planck's constant, namely: ℓ_P=√hbar Gc³≈1.616 252(81)⨯10⁻³⁵ mbox meters
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Planck length
Physicists hypothesize that space-time may cease to have a classical description at distances comparable to the Planck length.
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Physicists hypothesize that space-time may cease to have a classical description at distances comparable to the Planck length.
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