Quote Originally Posted by Xelbair
Well archie - by increasing movement vectors of small particles he can change their speed right? higher speed equals more kinetic energy Ek=(m*V^2)/2, where m is mass of particle here, V is its speed, therefore he can change temperature - because temperature is internal energy of object - which is kinetic energy of its every particle(neutrons, protons, and electrons). So go learn physics yourself ok? this is elementary physics man.
That's all well and good, but he never said he can change states of energy. He can mess with the kinetic energy of something all he wants, but he has shown he needs to introduce that energy into the system before he can manipulate it. That's why he taps/kicks objects he wants to hurl, throws/flicks objects before they go warp speed, and stomps the ground when he wants to propel himself or make those fun ground explosions he kept using on Touma.

Internal energy isn't directly related to kinetic energy. Friction converts kinetic energy to internal energy, or one of the three forms of heat transfer: conduction (i.e. friction, which he can indirectly influence), convection (which is can actively control) or radiation.

However, he can only control convection of fluids (which convection entails by definition).

This is elementary heat transfer