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Can you please EXPLAIN the needs of V2 multiplication in homonuclear collision frequency formula and v2 division in homonuclear collision density formula, but NONE in both heteronuclear collision frequency and density formula. 8RT Homonuclear collision frequency, = PINA RT 2 TIM1 d1 + Heteronuclear collision frequency, RT 2 8RT M M2 7 M1+M2 211 = V2(n)(Cad)* () 132 = (r) (7dz) ? (X4) Z11 = (1) (td) * C) ) (7) (da) * C **) C4) + PINA Homonuclear collision density, = (PANA RT V2 8RT TM1 2 RT Heteronuclear collision density, Z 12 = d1+d2 2 PINA RT P2NA RT 8RT M1M2 M1+M2 TT You may correct me if you notice the formula provided is incorrect. Appreciate your knowledge of sharing. I am eager to understand the topic of gas collision. Thanks