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Chapter 14: Q21Q (page 390)

Explain why air temperature readings are always taken with the thermometer in the shade.

Short Answer

Expert verified

In the presence of direct sunlight, the thermometer's reading is higher than the normal air temperature.

Step by step solution

01

Concepts

The level of mercury increases in the presence of sunlight because the emissivity of mercury is higher than air.

02

Explanation

In the presence of direct sunlight, the thermometer's reading is higher than the normal air temperature. This is because mercury can heat up in the presence of sunlight due to its emissivity. The thermometer will not reach the equilibrium temperature with the air accurately and may give a false reading. Hence, it is better to take the reading in the shade to measure the correct air temperature.

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Most popular questions from this chapter

A microwave oven is used to heat 250 g of water. On its maximum setting, the oven can raise the temperature of the liquid water from 20掳C to 100掳C in 1 min 45 s (= 105 s). (a) At what rate does the oven put energy into the liquid water? (b) If the power input from the oven to the water remains constant, determine how many grams of water will boil away if the oven is operated for 2 min (rather than just 1 min 45 s).

(II)During exercise, a person may give off 185 kcal of heat in 25 min by evaporation of water (at 20掳C) from the skin. How much water has been lost? [Hint: See page 399.]

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