. Hot air _____________ and cold air _____________ due to ___________.
*
1 point
falls; rises; gravity
rises; falls; gravity
rises; falls; bouyancy
falls; rises; bouyancy
rises; falls; gravity
Hot air rises and cold air falls due to buoyancy.
To determine the correct answer, we need to understand the behavior of hot and cold air in relation to gravity and buoyancy.
Hot air has the tendency to rise while cold air tends to fall. This phenomenon can be explained by considering the concept of buoyancy, which is the upward force exerted on an object submerged in a fluid. In this case, air acts as the fluid.
When air is heated, its molecules become energized and move more rapidly, causing them to spread apart. These hot air molecules are now less dense than the surrounding cooler air, making them buoyant. As a result, hot air rises.
Conversely, when air is cooled, its molecules lose energy and slow down, causing them to come closer together. This cooler air becomes denser than the surrounding warmer air, making it more susceptible to gravity and causing it to sink.
Therefore, the correct answer is:
Hot air rises and cold air falls due to buoyancy.