Don’t confuse mass and weight
The SI units for mass and weight are often misused in everyday life. Incorrect expressions such as “This box weighs 6 kg” are nearly universal. What is meant is that the mass of the box, probably determined indirectly by weighing, is 6 kg. Be careful to avoid this sloppy usage in your own work!
In SI units, weight (a force) is measured in newtons, while mass is measured in Kilograms.
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