Mass, under my education, is how much "stuff" there is. That stuff is matter. Let's say there is a piece of paper in front of you. If that piece of paper was ripped in half, the two halves would have masses that add up to the original piece. If it was set on fire, all the gas molecules from the fire and the ashes left would have a mass that adds up to the piece of paper in the first place. This is different that weight because weight is mass times gravity. Weight on a mountain compared to the bottom of the ocean would be different even if is is the same object. Mass would still stay the same no matter what happens to it. That goes into the Conservation of Mass. Hope this helps.
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