GEOLOGY

Detailed explanation-1: -Hot or cold fluids can add or remove heat. Natural convection is caused by density differences. Hot air rises because it is less dense than cold air, so air will rise above a heater and sink near a cold window. Forced convection refers to fluids being pushed around by outside forces.

Detailed explanation-2: -Convection occurs when heat is carried away from your body via moving air. If the surrounding air is cooler than your skin, the air will absorb your heat and rise. As the warmed air rises around you, cooler air moves in to take its place and absorb more of your warmth.

Detailed explanation-3: -Air Density and Temperature This is because warmer molecules of air move faster, creating an expansion effect that decreases air density. Colder air moves slower, collects together, and sinks with higher density. This is why warm air rises above cold air.

Detailed explanation-4: -The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less.

Detailed explanation-5: -Convection takes place because as fluids heat up, their molecules begin to spread out and the fluid becomes less dense. As the density decreases, the fluid rises. This is evident when a pot of water is heating up.