Last Updated
：2025/11/20
relativistic mass
Noun
countable
uncountable
Japanese Meaning
観測者に対して相対論的な速度で運動する物体に現れる、相対論的効果による質量の増加現象
（ plural ）
Quizzes for review
(physics) The increased mass of an object moving at relativistic speed relative to an observer.
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relativistic mass
As the spacecraft approached light speed, the physicist explained that its relativistic mass would increase significantly from the viewpoint of an outside observer.
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As the spacecraft approached light speed, the physicist explained that its relativistic mass would increase significantly from the viewpoint of an outside observer.
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