Question

what is mass in science

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$Mass is a measure of the amount of matter in an object. Mass is usually measured in grams (g) or kilograms (kg). ... An object's mass is constant in all circumstances; contrast this with its weight, a force that depends on gravity. Your mass on the earth and the moon are identical.
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Answer 2

The mass of an object is a measure of its Inertia. We know that greater the mass of an object, greater is its inertia.

The SI unit of mass is kilogram (kg) and mass of an object is gradually measured by using a common beam balance.

Since mass is a measure of its Inertia, the mass of an object is constant and does not change under different conditions. Thus, mass of an object does not change from place to place. It means that mass of a given object remains unchanged at all places on the earth, on other planents and the moon and even in outer space.

Mass is a scalar having only a magnitude and no sense of direction.