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Chapter 16: Problem 3

If you put a thermometer in direct sunlight, what do you measure: the air temperature, the temperature of the Sun, or some other temperature?

Short Answer

Expert verified
The thermometer in direct sunlight measures 'some other temperature', which is a combination of the air temperature and the added heat from the sun's radiation it absorbs.

Step by step solution

01

Understanding the Sunlight Effect

The sun emits radiation in the form of light and heat. When a thermometer is placed under direct sunlight, it absorbs this radiation, causing the temperature it observes to increase.
02

Determining the Measured Temperature

A thermometer measures the temperature of its immediate environment. If it's exposed to the sun, it's measuring the temperature of itself as it absorbs the sun's radiation and heats up. This temperature is not the air temperature and it's also not the temperature of the Sun which is much, much higher.
03

Clarify the Specific Temperature Measured

The thermometer absorbs the sun's radiation and heats up beyond the air temperature, therefore, it is not precisely measuring the ambient air temperature. It measures a combination of both the environmental temperature and the added heat from the direct sunlight it absorbs, making it some 'other' temperature.

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