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# Gravitational field strength definition

The gravitational field strength ($g$) is the gravitational force per unit mass.

$g$ has units of $\text{N/kg}.$

At the surface of the Earth the gravitational field strength is roughly constant. Its value is $g = 9.81 \text{ N/kg} \approx 10 \text{ N/kg}.$

The gravitational field strength on other planets is different to on Earth. On Mars $g = 3.8 \text{ N/kg}$ and on Jupiter $g = 26 \text{ N/kg}.$

The gravitational field at the surface of the Sun is about 30 times larger than at the surface of the Earth.