rest mass

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Definitions from WordNet

Noun rest mass has 1 sense

rest mass - (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body
--₁ is a kind of mass

Definitions from the Web

Rest Mass

Definition

Rest mass, also known as invariant mass or intrinsic mass, refers to the mass of an object when it's not in motion relative to an observer.

Usage

Part of Speech: Noun

Sense 1:

The rest mass of a particle in physics is a fundamental property that remains constant regardless of the particle's motion or velocity.

Example Sentence: The rest mass of an electron is approximately 9.1 x 10^-31 kilograms.

Part of Speech: Adjective

Sense 1:

When used as an adjective to describe an object, rest mass implies that the object is not in motion or is stationary.

Example Sentence: The rest mass energy of the system was calculated to be 4.18 gigaelectronvolts.

Part of Speech: Verb

Sense 1:

When used as a verb, rest mass means the act of determining or measuring the mass of an object when it's at rest.

Example Sentence: Scientists attempted to rest mass the unknown particle to identify its fundamental characteristics.