What is the difference between amu and u in atomic mass units?

[brycenrg]

Homework Statement

What is the difference between amu and u?
In my book they seem to use u but on my online homework it uses u and it seems to be the same thing.

Homework Equations

chemistry has too many special units

The Attempt at a Solution

atomic mass unit 1/12 mass of an atom of carbon 12
u unified atomic mass unit 1 g/mol
I still don't understand what's the importance of the two like what equations do you use over the other.

 

[BvU]

One and the same thing. Also known (but not widely ) as Dalton, symbol: Da

(And in chemical engineering they like dimensionless numbers; one of them is the Damkohler number, with the symbol -- you guessed it! -- Da )