Discussion
Which quantity does a thermometer in a Stevenson screen measure?
Answer: B
The screen shields the thermometer from direct and reflected radiation while allowing free ventilation, so that it registers the temperature of the air rather than its own radiation balance. Standard height is 1.25 to 2 metres. Without such shielding a thermometer in sunlight can read many degrees too high, which is why unscreened readings quoted in the media are often misleading. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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