Heat Transfer

Front

What is the transfer of heat by movement of liquids or gases?

Back

convection

Answer explanation

The transfer of heat by movement of liquids or gases is called convection. In this process, warmer areas of a fluid rise while cooler areas sink, creating a circulation pattern that transfers heat.

Front

What is the transfer of heat through direct contact?

Back

Conduction

Answer explanation

The transfer of heat by direct contact is called conduction. In conduction, heat moves through materials when particles collide, transferring energy directly from one to another.

Front

What is the transfer of heat energy by electromagnetic waves through space?

Back

Radiation

Answer explanation

The transfer of heat energy by electromagnetic waves through space is called radiation. Unlike conduction and convection, which require a medium, radiation can occur in a vacuum, making it unique in heat transfer methods.

Front

You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer because of _?_. Options: conduction, convection, radiation.

Back

Conduction.

Answer explanation

The spoon feels warmer due to conduction, which is the transfer of heat through direct contact. The heat from the hot soup transfers to the metal spoon, making it warm.

Front

You buy a lava lamp from the store. As the lamp heats up, blobs of liquid rise to the top, then sink back down to the bottom. This process continues because of _?_. Options: conduction, convection, radiation

Back

convection

Answer explanation

The rising and sinking of the blobs in the lava lamp is due to convection. As the lamp heats up, the liquid expands, becomes less dense, and rises. When it cools, it becomes denser and sinks, creating a continuous cycle.

Front

You are doing your homework at a desk that is underneath a lamp. You start to feel hotter because of _?_ from the lamp. Options: conduction, convection, radiation.

Back

radiation

Answer explanation

You feel hotter due to radiation from the lamp. Radiation is the transfer of heat through electromagnetic waves, which is how the lamp emits heat to warm you, unlike conduction or convection.

Front

Why does warm air rise when you move from the bottom bunk to the top bunk?

Back

Convection

Answer explanation

The warm air rises due to convection, which is the process of heat transfer through the movement of fluids. As air warms, it becomes less dense and rises, while cooler air moves down to take its place.

Front

How is heat transferred to your hand when you feel warmth near a hot plate without touching it?

Back

Radiation

Answer explanation

Heat is transferred to your hand by radiation, which is the transfer of heat through electromagnetic waves. This is why you feel warmth without direct contact with the hot plate.

Front

You are roasting marshmallows at a campfire. The metal skewer (stick) that you’re cooking your marshmallow on burns your hand because of _?_. Options: conduction, convection, radiation.

Back

conduction

Answer explanation

The metal skewer conducts heat from the fire to your hand, causing a burn. This transfer of heat through direct contact is known as conduction, making it the correct answer.

Front

What happens when ice cubes melt in a glass?

Back

Heat is transferred from the warmer water to the ice cubes.

Answer explanation

When ice cubes melt in a glass, heat is transferred from the warmer water to the ice cubes. This process causes the ice to absorb energy, leading to its melting.