What unit in the metric system is used to measure weight or mass?

Answer 1

People use "kilogram" for both weight and mass, but that usage is wrong.

The 'kilogram' and 'gram' are units of mass, not weight. For weight, you need a unit

of force, which is the "Newton".

If you prefer to remain lazy and say that one kilogram of mass weighs one kilogram,

you can get away with it as a grocer, an office worker, or a taxi driver. But if you

intend to become an astronaut, an astronomer, or a space-tug pilot, you'll need to

learn how to do it right. Otherwise you'll find yourself in an uncomfortable position

some day, like on the moon, where a kilogram weighs only 1/6 of a kilogram.

That would definitely lead to all kinds of confusion.