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"Heaviness". The downward force caused by gravity on an object.

This bar of gold has a mass of 1 kg, and weighing scales would normally show 1 kg (if they are here on Earth and not moving).

Even though weight and mass are different things, weight often uses the units of mass. For example grams, kilograms and, tonnes (Metric) or ounces and pounds (US units)

See: Mass