Which of the following correctly defines mass?

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The concept of mass is defined as the total quantity of matter in an object. This means that mass is a measure of how much "stuff" is contained within an object, regardless of its volume or the gravitational field it is in.

Mass is typically measured in kilograms or grams, and it remains consistent no matter where the object is located in the universe, making it an intrinsic property of the object itself. This definition captures the essential idea that mass relates to the amount of material that composes the object, as opposed to other concepts such as volume, which pertains to the space the object occupies, or weight, which refers to the gravitational force acting on the object. Such clarity in understanding mass is fundamental in physics and various applications in science and engineering.