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Comparing Diffusion Rates

publish date: 2026/05/19 08:39:32.272940 UTC

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How does the rate of molecular diffusion inside liquids generally compare to the rate of molecular diffusion inside gases?

Diffusion is much slower in liquids because liquid molecules are tightly crowded together, resulting in far more frequent collisions.

Diffusion is much faster in liquids because the higher density pushes particles forward with greater mechanical force.

The rates are identical because temperature dictates molecular kinetic energy evenly across all states of matter.

Liquids do not experience true spontaneous molecular diffusion unless an external current is applied.

Correct Answer

Diffusion is much slower in liquids because liquid molecules are tightly crowded together, resulting in far more frequent collisions.

Explanation

In a liquid, molecules are tightly packed and in near-constant contact with their neighbors. Because the intermolecular spaces are so small compared to the vast empty spaces in a gas, a migrating molecule in a liquid hits an obstacle almost immediately, making the net rate of diffusion significantly slower.

Reference

Basic Physics: A Self-Teaching Guide

Quizzes you can take where this question appears

Diffusion through liquids and gases