Assertion (A): Water droplets form on the outer surface of a glass con...
- Assertion (A) is true: Water droplets form on the outer surface of a glass containing ice-cold water because the cold temperature of the glass causes moisture in the air to condense.
- Reason (R) is false: Water does not evaporate from the glass and condense on the outside. Instead, the moisture in the surrounding air condenses on the cooler surface of the glass.
- Therefore, the correct option is C: The assertion is true, but the reason is false.
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Assertion (A): Water droplets form on the outer surface of a glass con...
Understanding the Assertion and Reason
The scenario involves a glass with ice-cold water and the formation of water droplets on its outer surface. Let's analyze both the assertion and the reason.
Assertion (A): Water droplets form on the outer surface of a glass containing ice-cold water.
- This statement is true. When warm, moist air comes into contact with the cold surface of the glass, the air cools down.
- As the air cools, its capacity to hold moisture decreases, leading to condensation and the formation of water droplets on the outer surface.
Reason (R): Water evaporates from the glass and condenses on the outside.
- This statement is false. The primary process occurring is not evaporation from the glass but condensation of moisture from the warm air.
- The water droplets form due to the condensation of water vapor in the air, not from water evaporating from the glass itself.
Conclusion
- Since the assertion is true (A) and the reason is false (R), the correct option is “c.”
- The droplets form due to the cooling of warm air, not because of evaporation from the glass.
Key Takeaways
- Water droplets are a result of condensation on the cold surface.
- The reason provided does not accurately explain the phenomenon.
Understanding these principles helps clarify the distinction between evaporation and condensation, critical concepts in thermodynamics and everyday observations.