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Chapter 14: Q6Q (page 390)

Why does water in a metal canteen stay cooler if the cloth jacket surrounding the canteen is kept moist?

Short Answer

Expert verified

When the water soaked by the clothes evaporates, the heat needed for the evaporation process is taken from the interior of the canteen. This removal of heat energy from the interior keeps the interior of the canteen cool.

Step by step solution

01

Understating evaporation

Evaporation is a unit operation that involves the elimination of water from a fluid and its conversion from liquid to gas. This process is generally used in manufacturing biological drugs.

02

Explanation for why water in a metal canteen stays cooler if the cloth jacket surrounding the canteen is kept moist

When a cloth jacket surrounding the canteen containing water is kept moist, then it required heat for the process of evaporation of water from moist cloth. The heat needed is taken from the canteen's interior. This extraction of energy from the interior keeps the interior of the canteen cool.

Since metal is a good conductor of heat, it allows the transfer of heat easily from water to the cloth jacket and thus keeps the water cool.

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Most popular questions from this chapter

In a typical squash game (Fig. 14–21), two people hit a soft rubber ball at a wall. Assume that the ball hits the wall at a velocity of 22 m/s and bounces back at a velocity of 12 m/s, and that the kinetic energy lost in the process heats the ball. What will be the temperature increase of the ball after one bounce? (The specific heat of rubber is about\(1200\;{\rm{J/kg}} \cdot ^\circ {\rm{C}}\).)

The temperature of the glass surface of a 75-W lightbulb is 75°C when the room temperature is 18°C. Estimate the temperature of a 150-W lightbulb with a glass bulb the same size. Consider only radiation, and assume that 90% of the energy is emitted as heat.

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Goose down sleeping bags and parkas are often specified as so many inches or centimeters of loft, the actual thickness of the garment when it is fluffed up. Explain.

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