| Mass is a property of matter. The mass of an object is the same everywhere, | Weight depends on the effect of gravity. Weight varies according to location. |
| Mass can never be zero. | Weight can be zero if no gravity acts upon an object, as in space. |
| Mass does not change according to location. | Weight increases or decreases with higher or lower gravity. |
| Mass is a scalar quantity. It has magnitude. | Weight is a vector quantity. It has magnitude and is directed toward the center of the Earth or other gravity well. |
| Mass may be measured using an ordinary balance. | Weight is measured using a spring balance. |
| Mass usually is measured in grams and kilograms. | Weight often is measured in newtons, a unit of force. |
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