Convection in Air Investigation 5 Part 3 Convection

Convection in Air Investigation 5, Part 3

Convection in the atmosphere • Sun shines on a large parking lot • The blacktop absorbs some of the radiant energy • What might happen to the part of the atmosphere close to the parking lot?

Convection Chamber Smoke allows you to see the moving air Ice represents the cold temperatures of the atmosphere Candle represents a hot location on earth’s surface

Convection Chamber • After observing the convection chamber draw a diagram showing the movement of smoke and air in the chamber on page 29 of your lab book. • On your diagram, explain how convection occurs in the convection chamber.

How Convection Occurs? Smoke loses heat by conduction when it touches the metal cover Smoke becomes less dense and rose to the cover Smoke was colder and more dense, so it sank Moved across the bottom to the candle where it is heated

Molecular Model • Fluids becomes less dense as its temperature increases! • Fluids become more dense (denser) as their temperature decreases.

Convection Cell on Earth • How can what you observed in the convection chamber translate to a convection cell on earth? • Draw a model showing a convection cell on earth and explain how heat would transfer in this convection cell.

Convection Cell on Earth Radiation heats Earth’s surface Warm air expands and becomes less dense Air above surface is heated by conduction and reradiation Cool air contracts and becomes more dense

Convection Cell • The cycle of air where warm air expands and rises, and then air cools and falls back to Earth.