Heat energy is described as the kinetic energy of a molecule or atom, but how does that energy present itself?
I keep hearing that it's "random", akin to a randomly jittering atom in space, but I'd like to understand specifically how this energy presents itself in comparison to macroscopic scale things we can see.
If I throw a ball in zero gravity, it will travel along a direction vector at a given velocity, of which you can calculate its kinetic energy and momentum, and everything is predictable enough.
If you had a lone atom at a certain temperature (heat/kinetic energy), is it moving in a relatively consistent manner like the ball, such as a translation along some vector?
If so, are the interactions with trillions of other atoms in dense surroundings that give rise to the "randomness" of its movements?