In heat, atoms vibrate to pass energy. In mass, molecules physically migrate from high to low concentration areas.
A helpful way to grasp (Heat and Mass Transfer) is to look at the analogy between the two processes. They follow almost identical logic: Driving Force: Heat moves due to a temperature gradient ( ΔTcap delta cap T ), while mass moves due to a concentration gradient ( ΔCcap delta cap C The Math: Just as Fourier’s Law governs heat conduction ( ), Fick’s Law governs mass diffusion ( Transferencia de calor y masa
numbers, or see how this applies to a specific industrial process ? In heat, atoms vibrate to pass energy
The water evaporates into the air (diffusion/convection) and, if you add sugar without stirring, it slowly spreads through the liquid (diffusion). if you add sugar without stirring
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