If it's in the shade, then the temperature of the air that wafts past it is.
If it's in direct sun, then it's displaying the temperature of the structure of the
thermometer itself, as it absorbs direct solar radiation and its temperature rises
above that of the air that wafts past it.
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Depends on you
when the thermomter used mecury comes to nearest
The measurement unit depends on the characteristic that is being measured.
the thing being measured
Dependent variable