Enough now! Stop playing in the tub and start washing
yourself. Even behind your ears.
Soap washes filth.
Big news! Everybody knows that.
But can anyone tell how? I'll try!
As it was already explained in the bubbles section, soap
is partly hydrophobic, partly absorbant. When gently mixed
with water, soap molecules gather on the surface so that the
hydrophobic parts can escape water contact, like this :
Once the surface is fully filled with soap molecules, leftovers
need to find another method to limit water contact. Look at what
they found :
Molecules gather and form groups where the hydrophobic parts
are protected by the absorbant ones.
Another solution is to find a friendly stain to hook on to.
Stains don't like water either.
This is the first part of the washing process.
Soap molecules surround stains.
Then when stains are detached from your skins (or maybe
your clothes), water will easily penetrate between them. Last
step : flushing.
In a nutshell, washing is :
apply soap
let water work
flush.
Quite simple, eh? And the little dirty marks in the tub after emptying
it: those are your washed away dirt, flushed by water!
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