Can drops of water not be raindrops simply because they are each measured separately? The water droplet knows not of the rain.

Simply put; 1. A singular lonely atom cannot be heated as heat is a quantification of atomic relative Brownian movement (local interactions caused by relative atomic velocity) therefore heat cannot be transmitted in a vacuum. 2. Individual atoms with no interaction have null molecular density and so they are gaseous. 3. Pressure and temperature are functions of atomic density and momentum.