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Difference between atomic mass and atomic weight

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3 Answers

The other two respondents are correct, but backwards in their answers. Weight is relative to gravity, while mass is constant no matter where you are. For example, your weight is different at sea level vs. on the moon, but your mass remains constant. Same with atomic weight/mass. The modern expression is atomic MASS, as it remains constant irrespective of gravitational forces.
For me there is not difference, the term atomic weight has been used widely instead of he term atomic mass, although the weight is a force, the old usage of atomic mass has been discouraged but sometimes the student needs to get the ols vocabulary to understand certain texts.

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