We review how bond and thermal energy models offer insight into matter's particulate nature, despite some approximations. These models let us predict thermal behaviors and temperature connections, sim...We review how bond and thermal energy models offer insight into matter's particulate nature, despite some approximations. These models let us predict thermal behaviors and temperature connections, simplifying complex phenomena. Thermodynamics will deepen this understanding, adding precision at the expense of simplicity. Unanswered questions, like bond strength determination, will require exploring forces and vibrations, which we’ll revisit later to advance our particle model.