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Face cream belongs to which type of colloid form?
Solid
Foam
Gel
Emulsion
Emulsion
Face cream is a classic example of an emulsion. An emulsion is a colloid where two immiscible liquids (typically oil and water) are stabilized by an emulsifying agent to form a stable mixture.
Face cream is a classic example of an emulsion. An emulsion is a colloid where two immiscible liquids (typically oil and water) are stabilized by an emulsifying agent to form a stable mixture.
Think of mayonnaise: it is essentially oil and vinegar (water-based) forced together into a creamy, thick consistency by egg yolk, which acts as the emulsifier, much like the ingredients in your face cream.
Emulsion=Liquid┬аdispersed┬аphase+Liquid┬аdispersion┬аmedium
In face creams, tiny droplets of oil are dispersed within a continuous water phase (oil-in-water emulsion) or vice-versa (water-in-oil). Because oil and water naturally separate, an emulsifying agentтАФlike a surfactant or soapтАФis added to reduce the interfacial tension between the two, allowing them to remain suspended as a uniform, creamy mixture.
An emulsion is a liquid-in-liquid colloidal system.
Emulsifying agents are essential to prevent the two liquid phases from separating over time.
Face creams usually belong to the Oil-in-Water (O/W) type of emulsion, which feels lighter and is non-greasy.
Provides a stable delivery system for both water-soluble and oil-soluble ingredients.
Easy to apply and absorbs well into the skin.
Can be susceptible to microbial growth due to the presence of water.
Requires chemical preservatives to maintain shelf-life.
Cosmetic moisturizers and lotions.
Pharmaceutical ointments and medicinal creams.
Solid foams are materials like pumice stone or bread.
Gels are colloids where a liquid is dispersed in a solid phase, like hair gel or jelly.
Option A (Solid) is incorrect as face cream is a semi-solid liquid-in-liquid system.
Option B (Foam) is incorrect as foam is gas dispersed in a liquid.
D is correct тАФ Face cream is a stable emulsion containing oil droplets dispersed in water (or vice-versa).
Remember: A colloid is defined by the physical states of the dispersed phase and the dispersion medium. For an emulsion, both must be liquids!
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