How does air above a heated surface move?

Answer 1

When air is warmed up, its molecules move faster and faster and as a result they move further from each other. They still have the same mass, but they now occupy a larger volume. This means that its density is smaller.
The opposite when air is cooled off. The molecules slow down, get closer together, occupy a smaller volume and therefore its density is bigger.

When air is warmed up, it goes up. Once it's up there, is cools off and goes back down. Near the heated surface the air gets warmed up again, goes up, cools down, goes back down, and again and again.
That's called a convection cell.

Answer 2

Heat rises as it is less dense than cooler air. When the air above a heated surface gets hot, it gains energy, making the air less dense. As the hotter air goes up, cooler air from the sides sweep into the empty spaces left from the rising hot air. As the hot air reaches a cooler spot (far from the heat), it begins to cool down and get pushed to the sides and slowly drops. This is like a fountain shape. This movement of hot particles is known as a convection current.

Answer 3

Air above a heated surface will be heated by conduction and rise. Cool air will be pulled in from the the sides.

Answer 4

The pocket of air tends to rise above a heated surface, regardless of its humidity.

Think of a ribbon of asphalt highway, in Texas,or Arizona, in July, and imagine that mirage-laden air pocket rising, until the particular, heated-air pocket reaches an ambient temperature, where it's heat dissapates, and cools.

Even in Texas, in July, cooling happens!

Merry Christmas!!

Answer 5

yes, besides the fact that air is always constantly moving at high speeds in random directions, heated air expends, thus achieve a lower density than cool air, causing it to rise upwards, while cool air takes its place and get heated as well, this is called convection