Weight vs Mass

The differences between weight and mass

We often confuse weight and mass. Although they have similarities, and come together in some areas, they are not the same thing ! On the next page, we will explain the main differences between these two terms and what they mean.

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Weight

Mass

VS

In grams (g)

In Newtons (N)

Weight is expressed in newtons, which represent force and is calculated by multiplying the mass in kg by the gravitational force, represented by the formula m/s², so to obtain the weight of an object on Earth, you multiply its mass in kg by aproximately 9.8.

Mass can be calculated either by multiplying the density by the volume or dividing the weight by the gravitationnal acceleration, so an object thay weighs 686 N on Earth has a mass of 70 kg.

Weight varies depending on the gravitationnal acceleration, so for instance, an object that weight 686 N on Earth would weight much less on the Moon because the gravitationnal acceleration is inferior.

Mass does not vary as it depends on the amount of matter (atoms and else) present in the object.