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# Weight

Weight $(W)$ is the gravitational force acting on a body of mass $\Tblue{m}$. \begin{gather*} \Tgreen{\text{weight}}=\Tblue{\text{mass}} \times \Tred{\text{gravitational field strength}} \\ \Tgreen{W}= \Tblue{m} \times \Tred{g} \end{gather*}

As weight is a force, its SI unit is the newton $(N)$.

Mass is an intrinsic property of an object and does not depend on where the object is.

Weight is the force on an object and depends on the gravitational field around the object.

The mass of a $10 \text{ kg}$ stone is the same on Earth and on Mars. But the weight is approximately $98 \text{ N}$ on Earth and $37 \text{ N}$ on Mars.

The weight of the astronaut is lower on the Moon than on Earth.