How is Molecular mass is the molecular weight? [closed]








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Wikipedia says molecular weight is the mass!! I can't get it the weight is the mass times 10 so we cannot neglect that, because 10 amu is not equal to 1 amu




I'd absolutely consider **molecular mass** as the preferred term. Wikipedia even has the article with that title and the sloppily used term **molecular weight** redirects to **molecular mass**. 


The point being that mass of some sample would be the same on earth as the Moon or Mars, but the weight would change. Since we're stuck on earth we really weigh samples in Earth's gravitational field of $9.806\mathrm{~m~s^{-2}}$. But all laboratory balances use mass units. The weight in Newtons is 9.806 (rounds to 10) times the mass in kg. In science we don't like standard units that depend on arbitrary standards, and the gravity of the earth is arbitrary value on a galactic scale. Gravity isn't even constant over the surface of the earth. Read about how the [meter](https://en.wikipedia.org/wiki/Metre) has been standardized. Fascinating to me. 


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