My olympic barbell

This is an easy one (I hope)… Does anyone have any idea how much an olympic style barbell weighs? I realize there is probably a range, but I was actually hoping there was a standard weight that most of them are.

Anyone?

Bueler? Bueler?

I’ve heard 45 lbs. Anyone want to confirm that?

20Kg

http://www.qwa.org/articles/rules.asp