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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 cold environment, a person can lose heat by conduction and radiation at a rate of about 200 W. Estimate how long it would take for the body temperature to drop from 36.6°C to 35.6°C if metabolism were nearly to stop. Assume a mass of 65 kg. (See Table 14–1.)

(II) A 100-W light bulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 3.0 cm and is 0.50 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?

An iron meteorite melts when it enters the Earth’s atmosphere. If its initial temperature was\( - 105^\circ {\rm{C}}\)outside of Earth’s atmosphere, calculate the minimum velocity the meteorite must have had before it entered Earth’s atmosphere.

A mountain climber wears a goose-down jacket 3.5 cm thick with total surface area \({\bf{0}}{\bf{.95}}\;{{\bf{m}}{\bf{2}}}\). The temperature at the surface of the clothing is \( - {\bf{1}}{{\bf{8}}{\bf{o}}}{\bf{C}}\) and at the skin is 34°C. Determine the rate of heat flow by conduction through the jacket assuming (a) it is dry and the thermal conductivity k is that of goose down, and (b) the jacket is wet, so k is that of water and the jacket has matted to 0.50 cm thickness.

(II)A 215-g sample of a substance is heated to 330°C and then plunged into a 105-g aluminum calorimeter cup containing 185 g of water and a 17-g glass thermometer at 10.5°C. The final temperature is 35.0°C. What is the specific heat of the substance? (Assume no water boils away.)
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