Does milk EXPAND the soap???

[JCFantasy23]

Found the following recipe online, and it states that the milk enables more bars to be produced from the same batch. The only way I could figure this being so is if the milk somehow thickens the batch considerably. Anyone know this to be true?

Here's the recipe, quoted with text:

Soap V

A traditional and blender soap combination. The fats are expensive, but milk allows for about 12 bars, vs. only 6 bars of the same recipe without milk. Pretty sneaky, hugh?

8 oz weight cocoa butter

5 oz weight palm oil

3 oz weight castor oil

2.2 oz weight lye (sodium hydroxide)

1 cup cold milk (I used 2% right from the frig)

1 cup water

1 tablespoon essential oil (I added 2 chamomile tea bags and 2 jasmine tea bags, dry)

Fats: 100 degree range

Lye/water/milk combination: 125 degree range

Dissolve the lye in the water. Add all ingredients to the blender. Process about 30 seconds, or until the mixture looks smooth and a uniform color. It will not trace. Pour it into the molds (it won't separate, trust me)

[RobinInOR]

Well yeah, you double your liquid your recipe is going to take more volume, thus more bars. And, since this is a blender soap, I'm betting it's the whipping of the milk - you're making whipped cream that holds more air. I'm betting that's all it is.