Question

A teacher opens a window on a cold day. Which statement explains why the room starts to feel cooler? (1 point)
Responses

The kinetic energy of the air molecules outside is higher than the kinetic energy of the air molecules inside.
The kinetic energy of the air molecules outside is higher than the kinetic energy of the air molecules inside.

Air moves from the areas of higher temperature to areas of lower temperature.
Air moves from the areas of higher temperature to areas of lower temperature.

The density of the air is lower on the inside than on the outside.
The density of the air is lower on the inside than on the outside.

Cold air is moving into the room from outside.

Answer 1

Cold air is moving into the room from outside.

Explanation: On a cold day the outside air is denser (and has lower average kinetic energy) than the warm indoor air, so when the window is opened the colder outside air flows in and displaces the warmer air, making the room feel cooler.