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, 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.
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.
Warm air always rises.
1 answer
When air in a room gains thermal energy from a heater, its molecules start to move more quickly, colliding with each other and bouncing around more frequently. This increased movement causes the air molecules to spread out and take up more space, making the warm air less dense than the cooler air around it. As a result, the warm air rises upward, and cooler air from the surroundings moves in to fill the space left behind. This process is known as convection, and it is the reason why warm air tends to rise while cold air sinks.