The water evaporates into the air (diffusion/convection) and, if you add sugar without stirring, it slowly spreads through the liquid (diffusion).
Just as there is a thermal boundary layer where temperature changes near a surface, there is a concentration boundary layer where the mixture composition changes. Real-World Example: Think of a cup of hot coffee : Transferencia de calor y masa
The mug gets hot (conduction) and steam rises (convection). This is the "fast track
This is the "fast track." When a fluid moves, it carries both thermal energy and chemical species much faster than simple diffusion or conduction alone. In mass, molecules physically migrate from high to
Both can occur through stationary media (conduction/diffusion) or moving fluids (convection). Key Concepts to Remember:
In heat, atoms vibrate to pass energy. In mass, molecules physically migrate from high to low concentration areas.