Chapter 21 - Thermal Expansion

What is Thermal expansion?

• The transfer of thermal energy between materials by the collisions of particles

• Is a decrease in a materials size when temperature decreases

• An increase in a materials size when temperature increases

• Chicken fried rice

Tags

NGSS.MS-PS1-4

Coefficient of linear expansion, Coefficient of area expansion and Coefficient of volume expansion have the unit of....

• ^oC^-1

• ^oC

• W m^{-1 o}C^-1

• J m^{-1 o}C^-1

Tags

NGSS.HS-PS3-4

Thermal expansion of liquid depends on the expansion of the container that it fills. However, why does liquid overflow after heating?

• because container does not expand

• because coefficient of volume expansion for liquid is bigger than the container

• because liquid and container expand at the same amount

• because particles in solid container is more closely packed together than liquid

Is iron a conductor or insulator?

• Conductor
• Insulator

Tags

NGSS.MS-PS2-3

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to low
• low to high
• high to high
• It can travel high to low and low to high. 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

The length of copper wire at 20^oC is 4.5m. Calculate its new length when the temperature is 95^oC. Given α = 1.7×10^{-5 o}C^-1

• 4.55m

• 5.41m

• 5.11m

• 4.51m

The transfer of thermal energy between substances, which always moves from the warmer to the cooler substance.

• Heat
• Temperature
• Thermal Energy
• Convection

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

What happens to the molecules of a solid when it is heated?

• Slow down
• Speed up
• Don't change speed
• Shrink

Tags

NGSS.MS-PS1-4

Choose the symbol which denotes the 'coefficient of expansion'

• θ
• ρ
• Σ
• α