I can be heavy as a mountain or light as a feather, but I always resist change. What am I?

Category: Science · Difficulty: medium

Hint: I’m related to how much matter is in an object.

Answer

Substance

Explanation

Mass is a measure of the amount of matter in an object, influencing its resistance to acceleration.

This is a medium science riddle — a moderate challenge for most people. The answer is Substance.

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