"How much wort do hops absorb in the boil?"
The answer comes from Greg Noonan's "New Brewing Lager Beer"
whole leaf (flower) = oz./hops x 0.045gal
pellets = oz./hops x .02gal
So 2 0z of whole flower hops will absorb .09 gallons of wort. That's 1.44 Cups, .72 pints, or .34 liters.