GRADE 4 HEAT

What is conduction?

• Heat transfer through sound waves

• Heat transfer through electromagnetic waves

• Heat transfer through direct contact between particles of a substance

• Heat transfer through air particles

Give an example of conduction.

• Touching a metal spoon that has been sitting in a hot pot of soup

• Blowing on a bowl of hot soup

• Putting ice in a glass of water

• Stirring a cold drink with a straw

What is insulation?

• A type of food

• A material or substance that prevents the transfer of heat, electricity, or sound.

• A type of clothing

• A method of transportation

How does insulation help in preventing heat transfer?

• By absorbing heat and releasing it slowly

• By increasing the conduction of heat

• By allowing air to flow freely

• By trapping air pockets which reduces the conduction of heat.

What are the three types of heat transfer?

• Expansion, contraction, and evaporation

• Boiling, freezing, and melting

• Solidification, liquefaction, and vaporization

• Conduction, convection, and radiation

Explain the process of convection.

• Transfer of heat through the movement of a solid

• Transfer of heat through the movement of a gas

• Transfer of heat through the movement of a fluid

• Transfer of heat through the movement of a vacuum

What are some common heat sources?

• Some common heat sources include the sun, fire, stove, and heater.

• Snow

• Fan

• Ice

How does the sun act as a heat source?

• By generating energy from the clouds

• By reflecting energy from the stars

• By emitting energy in the form of heat and light

• By absorbing energy from the moon

What are the different ways in which heat can be transferred?

• Evaporation, condensation, and sublimation

• Expansion, compression, and diffusion

• Conduction, convection, and radiation

• Reflection, absorption, and transmission

Why is it important to understand the concept of heat transfer?

• To understand how energy moves in different systems

• To learn how to bake a cake

• To understand the concept of gravity

• To know how to build a house