Confused Beyond Measure

Sixteen ounces in a pint;
Sixteen in a pound.
One’s for volume, one’s for weight;
One’s a puddle, one’s a mound.
Different ounces, different uses;
Mixing them would not be sound.

They say eight ounces make a cup.
That’s wrong so many ways
‘Cause when I need a cup of flour,
That isn’t what it weighs!
Dry ounces in a fluid cup?
It puts me in a daze.

It’s just a plot to amplify
My many cooking flaws!
And sometimes, when I most despair,
I think: Did Dorothy pause
To ponder if she crushed the Witch
In dry or fluid Oz?