Q.Fog is a colloidal solution of

The study of colloids began with Thomas Graham, who found that sugar, urea and NaCl solutions diffuse readily through a parchment membrane while glue, gelatine and gum diffuse only slowly; he named the fast-diffusing substances crystalloids and the slow ones colloids (Greek: kola — glue, eidos — like). It is now understood that particle SIZE, not chemical identity, is what matters — reducing almost any substance's particle size into the 1–200 nm range converts it into a colloid. A colloid is a mixture in which one substance (smaller proportion, the dispersed phase) is finely distributed throughout another (larger proportion, the dispersion medium). …