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I mean that a scale does not always show your "true weight (w = mg). Scales show apparent weight -- how heavy you THINK you feel.
So when an elevator accelerates upward, you feel heavier. You feel more pressed to the ground, and a scale would register a higher reading. It seem like you are heavier, but you are not as your true weight has not changed (since g is still 9.8), but your apparent weight has.