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The liquid in a thermometer ______________ as the temperature increases.

• expands
• disappears
• freezes
• explodes

Many objects, such as train tracks and road joints, are specifically designed to allow extra space for ...

• thermal energy
• specific heat
• thermal expansion
• conductors

What happens to air particles when they are heated?

• Particles move faster and expand
• Particles move faster and become closer together.
• Particles move slower and the air expands
• Particles move faster become further apart

The picture shows a bimetallic strip in a fire alarm. When there is a fire outbreak, the bimetallic strip will get hot, ....

• bend downwards, complete the circuit and the alarm rings.

• bend upwards, open the circuit and the alarm will not ring.

• becomes longer, open the circuit and the alarm will not ring.

What is Thermal Contraction

• The movement of particles.

• A decrease in a materials volume when its temperature decreases

• The movement of fluids in a cycle because of convection

• A material through which thermal energy does not flow easily.

Water always expands as it's heated.

• True

• False

When objects contract upon cooling...

• volume increases and density increases.
• volume increases and density decreases.
• volume decreases and density decreases.
• volume decreases and density increases.

An increase in the volume of a substance when the temperature increases is called ___________________________________.

• kinetic energy
• thermal expansion
• temperature
• heat

Objects gain heat and _________. 

• expand
• contract

The movement of thermal energy from an object at a higher temperature to an object at a lower temperature is called ____________.

• thermal
• expansion
• temperature
• heat