You could but i would overflow.
I feel it's self explanatory. *it
I meant filling it. Sorry for that.
By definition, dissolve implies no increase in volume. Liquids would be mixing. Only solids becoming liquids without melting is dissolving.
Oh. That's kind of the point. It's just a waste of water to pour it into a glass already filled with water. My point is that you can dissolve sugar or flavour crystals in it for example and increase its value.
My product of reading a philosophy site immediately after browsing chemistry sites