Question

explain why diffusion occurs more quickly in gas then in liquid

Answer 1

The spaces between the constituent particles in gases are higher than in liquids. Thus, the particles in gases possess higher kinetic energy and move with higher speeds. Because of this, diffusion is faster in gases than in liquids. 

Answer 2

here is your answer
because the gas molecule have more kinetic energy and are smaller than liquid molecule .
diffusion in liquids is slower because the particle in liquids move very slowly . it happen faster if the temperature is increased
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