Mass

Mass is the amount of matter in an object and is measured in kilograms (kg).

  • A large object made of a given material has greater mass than a small object made of the same material because it contains less matter.
  • Mass is not the same as weight because an object of a known mass will weigh more on earth than on the moon.
  • An object of a known mass is weightless in free fall.
  • Weight is the force of gravity on an object and is measured in newtons (N).

https://en.wikipedia.org/wiki/Mass

https://en.wikipedia.org/wiki/Newton_(unit)