Convection

The video explains convection, a process where heat is transferred through gases or liquids by the movement of matter from warm to cold areas. It provides examples from daily life, such as warming hands over a heater and hot air balloons. The mechanism of convection is detailed, highlighting how heated substances expand and rise due to decreased density. An experiment demonstrates convection currents using smoke. The video also covers convection in Earth's mantle, driving plate tectonics and shaping landforms. Finally, it discusses convection's influence on weather, climate, and ocean currents, emphasizing its vital role in life on Earth.

What causes a hot air balloon to rise?

• Cold air entering the balloon

• Warm air moving downward

• Warm air moving upward

• Cold air moving upward

How does heat affect the kinetic energy of atoms and molecules?

• It decreases their kinetic energy

• It increases their kinetic energy

• It has no effect on their kinetic energy

• It makes them stationary

In the candle experiment, what demonstrates convection currents?

• The candle flame

• The temperature of the air

• The smoke moving in the box

• The color of the chimneys

What property allows solid rock in the mantle to flow?

• Density

• Rigidity

• Plasticity

• Elasticity

How does convection impact weather and climate?

• By creating static air conditions

• By cooling the Earth's surface

• By driving wind and ocean currents

• By preventing cloud formation