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Grade: upto college level
        
piece of ice and a warmer thermometer are suspended in an insulated evacuated enclosure so that they are not in contract. Why does the thermometer reading decrease for a time?
3 years ago

Answers : (1)

Vikas TU
6869 Points
							
Although the thermometer and the ice cube are not in intimate thermal contact,  due to the vacuum and isolation, there is an additional heat exchange due to black body radiation.  See: .  The thermometer, initially at a higher temperature than the ice, will radiate at a faster rate than the ice.   Eventually they have to come to the same equilibrium temperature.  
2 years ago
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