Changing the temp. of water or air

Sit up with good posture. Good if you meditate on some way to increase your focus and increase your chances of success. Imagine all the molecules of what you want to change. If it's a liquid then Imagine them more dence but not quite as tight as a solid. For a gas Imagine them moving freely. Imagine them moving and a speed you think they would probably move. There bumping into each other and bouncing somewhere else. To get them hotter imagine them speeding up and bumping more. Do that until whatever it is is warmer. Do the opposite until it gets colder to cool down.