Emulsions must be protected from excessive heat and freezing.

• A. True
• B. False
• C. Not applicable
• D. Unknown

Answer: (A)

Temperature extremes destabilize emulsions. The droplets are held in place by an interfacial film of surfactant or emulsifier, and excessive heat increases molecular motion, can weaken that film, and promote droplet coalescence, creaming, or Ostwald ripening, all of which ruin the emulsion’s uniformity. Freezing forms ice crystals that physically disrupt the droplets and their interfaces; when thawed, the system often doesn’t recover its original droplet size distribution, leading to phase separation or breakdown of the emulsion. Some components may also degrade or crystallize at high or low temperatures, further compromising stability. Keeping emulsions within a controlled temperature range helps maintain their physical stability, texture, and appearance.