Question

Whipped cream is an example of........

• A. Foam
• B. Aerosol
• C. Sol
• D. Emulsion

Hint:

Do not confuse cream with whipped cream.
Liquid cream is an oil-in-water emulsion, but the mechanical action of whipping incorporates air, transforming it into a foam.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
In food science, many systems are classified as colloids, where one substance (the dispersed phase) is microscopic and distributed throughout another substance (the continuous phase).
Key Principle:
The classification of a colloid system depends on the physical states of both the dispersed phase and the continuous phase.

Step 2: Detailed Explation:
Colloidal dispersions are classified as follows:
1. Emulsion: Liquid dispersed in a liquid (e.g., milk, mayonise).
2. Sol: Solid dispersed in a liquid (e.g., unset gelatin, starch slurry).
3. Aerosol: Liquid or solid dispersed in a gas (e.g., fog, smoke).
4. Foam: Gas dispersed in a liquid or solid continuous phase.
Whipped cream is produced by physically beating air (gas) into heavy cream (liquid).
During this process, the fat globules present in the cream partially coalesce and align themselves around the introduced air bubbles.
This forms a stable structural network that traps the air within the liquid serum phase.
Because the dispersed phase is air (gas) and the continuous phase is a liquid stabilized by fat and proteins, whipped cream is classified as a foam.

Step 3: Fil Answer
Thus, whipped cream is a classic example of a gas-in-liquid foam.