Mass

Mass measures inertia and acts as the source of Newtonian gravity.

A point mass idealizes a localized body's mass density as

ρ (x, t) = m δ^{(3)} (x - z (t))

, using the Dirac delta function. Its second mass moment tensor is

I_{ij} = m z_{i} z_{j}

. The approximation ignores its internal size and structure.

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Mass is a measure of the amount of matter in an object or substance. It is a fundamental property in physics and is typically measured in units such as grams (g) or kilograms (kg). Mass is a scalar quantity, meaning it has magnitude but no direction.

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