Atomic weight and atomic mass | Atoms, compounds, and ions | Chemistry | Khan Academy

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The difference between atomic weight and atomic mass in chemistry, and how it compares to the physics definitions of weight and mass.

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Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

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