Thermal Expansion and Contraction

3. If the atoms of an object are moving or vibrating fast, the temperature would be...

• Hot
• Cold
• Unknown

4. If the atoms of an object are moving or vibrating slow, the object would feel...

• Cold
• Hot
• Unknown

The air inside the balloon heats up and expands, the balloon rises. This is an effect of

• thermal expansion

• thermal contraction

• thermal radiation

• thermal conduction

Look at the diagram . Why there are gaps between metal connectors on bridge?

• To allow water flow through it rainy season

• To allow air flow during thunderstorm

• To allow the bridge to expand when the temperature of the surrounding increases

The liquid in the thermometer rises when it is placed in the hot water because ___________. 

• it gains heat from the hot water and expands.
• loses heat from the hot water and contracts. 
• the surrounding air is too warm. 
• the liquid is boiling. 

Copper, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?

• Copper

• Carbon Steel

• Zinc

Which best explains why a hot air balloon floats?

• The heated air expands to fill the balloon. The air in the balloon is now less dense than the surrounding air, causing the balloon to rise. This is an example of thermal expansion.

• The heated air expands to fill the balloon. The air in the balloon is now more dense than the surrounding air, causing the balloon to rise. This is an example of thermal expansion.

• The heated air contracts to fill the balloon. The air in the balloon is now denser than the surrounding air, causing the balloon to rise. This is an example of thermal contraction.

the picture represent a

• thermal expansion

• thermal contraction

What is Thermal Contraction 

• A Potato
• 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.

What is happening to the fluid inside the thermometer in this image?

• thermal expansion

• thermal contraction

• vaporization

• boiling