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 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.

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.

Warm air always rises.

Answer 1

Its molecules move around more quickly, so there is more space between them, making it less dense than the air above it. This reduced density causes the warmer air to rise above the cooler, denser air in the room. The rising warm air creates a convection current, which moves heat around the room and helps to distribute warmth evenly.