Anyway, every morning when I go to make my tea, I first fill it up with cold water up to about a 1/3 of the thermos because my tongue is super sensitive to hot. It gets buned easily and then I can't enjoy my lunch in comfort. I am always scared of taking a first sip of coffee when I order it because I don't want to burn my tongue. That's besides the point. What really goes on in my head as I fill the rest of the 2/3 with hot water is how the 2 temperatures of water really mix.
In my head, I want to look through a clear glass and color the hot water to see how the hot and cold intertwine and eventually become one to make warm water. I think back to the middle school tri-fold poster science projects, and kind of wish I thought of this earlier so I could answer my question.
I imagine it something like this:
