Understanding Air Convection Experiments

The video tutorial explains the concept of convection of heat through two experiments. The first experiment demonstrates convection in water using a flask, potassium permanganate, and a Bunsen burner. As the water heats, it expands and rises, showing convection currents. The second experiment uses a rectangular box with chimneys and a candle to illustrate convection in air. Smoke is used to visualize the convection currents as the heated air rises and cooler air sinks, creating a continuous flow.

What is the primary focus of the video tutorial?

• Convection of heat

• Evaporation

• Conduction of heat

• Radiation of heat

What is used to demonstrate convection of heat in water?

• A round flask with water

• A plastic container

• A glass of ice

• A metal rod

Why does the water at the bottom of the flask rise when heated?

• It solidifies

• It becomes more dense

• It evaporates

• It becomes less dense

What is the role of potassium permanganate in the experiment?

• To heat the water

• To color the water for observation

• To cool the water

• To solidify the water

What happens to the colored water in the flask during the experiment?

• It remains at the bottom

• It rises and sinks, showing convection

• It evaporates

• It freezes

What is used to demonstrate convection of heat in air?

• A plastic bag

• A glass jar

• A closed rectangular box with chimneys

• A metal box

What is placed below chimney B in the air convection experiment?

• A fan

• A heater

• A piece of ice

• A candle

How is the convection current in air made visible?

• By using smoke from a smoldering paper

• By using colored water

• By using a thermometer

• By using a fan

What happens to the air above the candle in the air convection experiment?

• It cools down

• It becomes denser

• It expands and rises

• It solidifies

What is the purpose of the chimneys in the air convection experiment?

• To block air flow

• To allow air to circulate and demonstrate convection

• To trap heat

• To cool the air