2 of 52 of 5 Items
Question
Why does air in a room rise when it gains thermal energy from a heater? (1 point)
Responses
Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.
Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.
Its molecules move around more quickly, so there is more space between them, reducing its mass.
Its molecules move around more quickly, so there is more space between them, reducing its mass.
Its molecules move around more slowly, so there is more space between them, making it less dense than the air above it.
Its molecules move around more slowly, so there is more space between them, making it less dense than the air above it.
Warm air always rises.
1 answer
The correct response is:
Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it.
When air gains thermal energy from a heater, the molecules in the air move faster and spread further apart, resulting in a decrease in density. This less dense warm air then rises above the cooler, denser air in the room.
