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Feature	Mass	Weight
Definition	Quantity of matter	Gravitational force on mass
Type	Scalar	Vector
Formula	—	W = mg
Unit	Kilogram (kg)	Newton (N)
Constant?	Always	Changes with g
Measured by	Beam balance	Spring balance

Example: On the Moon, a 70 kg astronaut has weight = 70 × 1.6 = 112 N (vs. 686 N on Earth).

Mass is fixed and measures matter content; weight is variable and measures the gravitational pull on that mass.

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