When the teacher opens the window on a cold day, the room starts to feel cooler because the colder outside air enters the room and mixes with the warmer air inside. This results in a decrease in the overall temperature of the room. Additionally, the exchange of heat from the warmer air inside to the colder air outside leads to a loss of thermal energy, contributing to the cooler sensation in the room.
A teacher opens a window on a cold day which statement explains why the room starts to feel cooler
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