Which description defines the coalescence process in emulsions?

Which description defines the coalescence process in emulsions?

• A. The dissolution of droplets into a solvent.
• B. The process where small droplets recombine to form larger ones.
• C. The evaporation of a liquid.
• D. The breaking apart of droplets.

Answer: (B)

Coalescence in emulsions is the process where small droplets collide and fuse to form larger droplets. When two droplets come together, the thin liquid film between them can rupture, allowing the droplets to merge into a single, bigger droplet. This reduces the total surface area of the dispersed phase and changes the droplet size distribution over time. It’s different from dissolution (where material dissolves into the surrounding liquid), evaporation (liquid turning into vapor), or breakup (droplets splitting into smaller pieces). So the description that small droplets recombine to form larger ones best captures coalescence.

Coalescence in emulsions is the process where small droplets collide and fuse to form larger droplets. When two droplets come together, the thin liquid film between them can rupture, allowing the droplets to merge into a single, bigger droplet. This reduces the total surface area of the dispersed phase and changes the droplet size distribution over time. It’s different from dissolution (where material dissolves into the surrounding liquid), evaporation (liquid turning into vapor), or breakup (droplets splitting into smaller pieces). So the description that small droplets recombine to form larger ones best captures coalescence.