Heat and its effects

Heat and its effects

Poll

For the same rise in temperature, liquids expand more than solids.

• True

• False

Open Ended

Why does the density of an object decrease, when volume increases?

Poll

What is the SI unit of temperature?

• degree Celsius

• Kelvin

• John

• degrees

Poll

Which substance expands most for the same rise in temperature?

• Solids

• Liquids

• Gases

Open Ended

Explain what happens to the particles in matter during expansion.

Open Ended

How can we prevent the concrete pavement from being damaged from expansion on a hot day?

Open Ended

What is a bimetallic strip?

Open Ended

Where are bimetallic strips found?

Open Ended

Why does the bimetallic strip bend when heated?

Multiple Select

Select the statements that are true regarding conduction.

• Conduction is the transfer of heat through a material without the obvious movement of the medium itself.

• Heat is transferred from a body of low temperature to a body of high temperature.

• Solids are better conductors of heat, compared to liquids and gases.

• Air is an insulator (poor conductor) of heat.

Multiple Select

Select the statements that are true regarding convection.

• Convection is the transfer of heat from one place to another by the movement of the medium itself.

• Heat is transferred through solids mainly by convection.

• Heat is transferred through liquids and gases mainly by convection.

• During convection, hot fluids sink while cold fluids rise.

• During convection, hot fluid rises as its density decreases, due to an increase in volume when the fluid is heated.