| Mass | Weight |
|---|---|
| A measurement of the amount of substance in a body. | A measurement of the amount of gravitational force acting on a body |
| SI Unit: kilogram (kg) | SI Unit: newton (N) |
| Constant regardless of the gravitational field strength | Varies according to the gravitational field strength |
| Measured by a beam balance or electronic balance | Measured by a spring balance |
| Scalar quantity | Vector quantity |