infer why chemists use models to study submicroscopic matter

SOLVED:Why is Equation (7.8) meaningful only for submicroscopic particles, such as electrons and atoms, and not for macroscopic objects?

SOLVED: Using the submicroscopic figure, which of the phases will have the highest average KE (Ex)? P = 2 atm; T = 5°C = 278 K, TB = 100°C = 373 K, Tw = 78°C = 351 K, Tw = -183°C = 90 K, T# = -196°C = 77 K, T1 = -78.5°C = 194.5 K.