[quote=whizzball1]
Heat is not energy, nor does it expand. Heat is the measure of how fast a particle is moving. Thermal Energy is the sum total of all the kinetic energy of an object. So however fast the particles are moving, that'a how hot they are. Vsauce is wrong in this respect. As a substance gets "hotter", it's actually moving faster, which is why solid turns into liquid turns into gas, and hot gas expands more quickly than cold gas. As you get hotter, you get plasma, and eventually you can get so hot that the protons and neutrons rip themselves apart into quarks and gluons. Heat can't just become pure energy. Heat is simply the speed of atoms. Thermal Energy isn't even its own energy, if you think about it. It's just the total of the kinetic energy. And since according to the kinetic-molecular model, atoms are always in movement and can't not be moving (otherwise they won't be atoms) the kinetic energy can't just escape and turn into "pure energy". And even that is a misnomer. Energy is the ability to do work. In the case of kinetic energy, that work is movement.Wow, that was long. TL;DR: "Absolute Hot" is impossible because heat is not energy.
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"Temperature is a measure of the ability of a substance, or more generally of any physical system, to transfer heat energy to another physical system. The higher the temperature of an object is, the greater the tendency of that object to transfer heat."
Heat energy. The movement is kinetic energy, so yes, heat is energy.
Watch the Vsauce video before criticizing it. YouTube it.