On a hot day the upstairs rooms in a house are usually hotter than downstairs rooms. Why?
(Choose the best answer. Hint: the answers are incomplete)
The roof insulation warms the air.
Warm air rises and cool air sinks.
Cool air is less dense than hot air.
heat rises.
The correct answer is: Warm air rises and cool air sinks.
The correct answer is: Warm air rises and cool air sinks.
On a hot day, the upstairs rooms in a house are usually hotter than downstairs rooms because warm air has a tendency to rise while cool air sinks. This is due to the difference in density between hot and cold air. When the sun heats up the air outside, the air molecules begin to move rapidly and spread apart, resulting in a decrease in density. As a result, the hot air becomes lighter and rises to the upper floors, causing the upstairs rooms to become warmer. Meanwhile, the cooler and denser air sinks to the lower floors, making the downstairs rooms relatively cooler.