Somebody said they are different because of gravity.
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In physics:
* Mass is basically how much matter something contains. (Its not exactly that but it is kinda like that.)
* Weight is the force of gravity on that mass. Technically measured in Newtons, (but you can measure it in ‘how much mass would you need to generate this force near the surface of the Earth’)
* The weight measurement on a scale is the force needed to hold up the object being measured.
In common, everyday language and scenarios, if you are near the surface of the Earth, and neither you nor the scales are accelerating, then those 3 things are essentially all the same, because they are designed to try to measure the same thing.
(If you happen to be not near the surface of the Earth, or and using scales that are accelearating, then these 3 concepts can become separate, and you probably need physics knowledge to be able to use them in any useful way.)
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