Why is there an atomic mass unit?

Answer 1

Why? Because atoms have definite and measurable masses....

We could report atomic masses with units of grams or kilograms. And thus an #""^1H# atom has a mass of #1.67xx10^-24 *kg# or #1.67xx10^-21 *g#. This is a bit inutile given that the we have to go thru the rigmarole of exponents, and even here they are a pain to write down and format....
Historically, while the mass of an hydrogen atom could not be experimentally measured … its mass could be inferred by reference to the mass of other atoms and molecules... and historically #1*"amu"# was #1/12*"th"# the mass of the #""^12C# #"isotope.."#
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Answer 2

The atomic mass unit (amu) is used to express the mass of atoms and subatomic particles because the masses involved are extremely small and expressing them in grams would result in inconveniently large numbers.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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