Hurricanes & Convection

When air is heated, its density ___________.

• increases

• decreases

• remains the same

When air is cooled, its density ___________.

• increases

• decreases

• remains the same

Which of the following is an application of convection?

• The movement of heat through a metal pan to the food.

• The use of ice box to keep drinks cool.

• The sea breeze that blows from sea to land.

• The use of wool blanket to keep the body warm.

In the process of convection, energy is transferred _________.

• because of temperature differences in a solid

• because of density differences in a liquid

• by the diffusion of molecules throughout a fluid

• by the vibration of molecules

Which of the following correctly shows the direction of convection currents in water?

• A

• B

• C

• D

Some dye in a beaker of water is gently heated. Why are the streaks of dye seen in the water?

• The hot dye is a better conductor than the cool water.

• The hot dye is a better convector than the cool water.

• The hot water is less dense than the cool water.

• The hot water is denser than the cool water.

What causes wind?

• movement of high pressure to low pressure
• movement of low pressure to high pressure

If differences in air pressure produce winds, what can you conclude about temperature and air pressure based on the figure?

• As warm air rises, it creates an area of lower pressure, and cooler air flows in as wind
• Warm air is denser than cold air is, creating an area of high pressure the produces wind.
• Winds flow from areas of low pressure to areas high pressure when temperature is warmer
• Air pressure decreases at night because temperature is lower, producing land and sea breezes

In convection, COOL air

• Rises
• Sinks

In convection, WARM air

• Rises
• Sinks