Mass and weight aren't the same thing

Explanation

Mass is the measure of the amount of matter in an object and is a scalar quantity (quantity defined by its magnitude alone), whereas weight is the gravitational force exerted on that mass, a vector quantity directed toward the Earth's center. On Earth, a 1 kg object weighs about 9.81 N, since weight = mass × g with g ≈ 9.81 m/s².