Chapter 21 - Thermal Expansion

Objects gain heat and _________. 

• expand
• contract

Tags

NGSS.MS-PS1-4

What is correct formula to calculate linear thermal expansion?

• ΔL = L₀α_LΔT

• ΔT = ΔL/Lα

• σ = F/A

• ε = ΔL/L

What are the SI units for linear thermal expansion (ΔL)?

• °C

• 1/°C

• m

In the equation for linear thermal expansion, what does 'L₀' represent?

• coefficient of linear expansion

• final length

• original length

• temperature

What does 'ΔL' stand for in the equation for linear thermal expansion?

• Delta L

• Length change

• Linear length

• Change in length

How is the linear expansion coefficient denoted in the equation?

• Δ

• β

• γ

• α

What are the SI units for linear expansion coefficient?

• °C

• 1/°C

• °C/1

Match the linear expansion coefficient (α) value to the material

• Brass

• 12 x 10^-6 1/°C

• Aluminium

• 24 x 10^-6 1/°C

• Steel

• 19 x 10^-6 1/°C

• Iron, cast

• 17 x 10^-6 1/°C

• Copper

• 10 x 10^-6 1/°C

Tags

NGSS.HS-PS3-4

Select the correct formula to calculate change in temperature.

• ΔT = Ti - Tf

• ΔT = Ti + Tf

• ΔT = Tf - Ti

• ΔT = Tf/Ti

Why is it important to consider linear thermal expansion in various applications?

• Consideration of linear thermal expansion helps prevent structural damage or failure in applications.

• Linear thermal expansion has no impact on applications

• Linear thermal expansion only affects small-scale applications

• Considering linear thermal expansion increases cost unnecessarily