Boiling Water on Moon – Rankers Physics

Calorimetry: Practice Problem & Solution

Assertion (A): A bottle is filled with water at \(40^{\circ}\text{C}\text{ on opening it at moon, water will boil}\). Reason (R): Atmospheric pressure on the surface of moon is zero and boiling point is proportional to pressure.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Calorimetry. Understanding the underlying formula is key to arriving at the correct answer below:

The moon has a negligible atmosphere, leading to near-zero surface pressure. At such low pressures, water's boiling point decreases significantly. Consequently, water at \(40^{\circ}\text{C}\text{ would readily boil}\). Both (A) and (R) are true, and (R) provides the correct explanation for (A).

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