Thermal Expansion
Physics ⇒ Heat and Thermodynamics
Thermal Expansion starts at 7 and continues till grade 12.
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See sample questions for grade 12
A brass rod and an iron rod of equal lengths are heated by the same amount. If the coefficient of linear expansion of brass is greater than that of iron, which rod will expand more?
A copper pipe of length 5 m is cooled from 30°C to -10°C. If α for copper is 1.7 × 10⁻⁵ /°C, what is the change in length?
A glass beaker is filled to the brim with water at 20°C. If both the beaker and water are heated to 80°C, will the water overflow? Explain.
A metal ball fits exactly through a ring at 20°C. If both are heated to 100°C, will the ball still fit through the ring? Explain.
A metal rod has a length of 1 m at 0°C. If its length at 100°C is 1.0012 m, what is its coefficient of linear expansion?
A steel rod of length 2 m is heated from 20°C to 120°C. If the coefficient of linear expansion for steel is 1.2 × 10⁻⁵ /°C, what is the increase in length?
Calculate the change in volume of a 1.5 L aluminum container when heated from 25°C to 75°C. (γ for aluminum = 7.2 × 10⁻⁵ /°C)
Define the coefficient of linear expansion.
Describe a practical application of thermal expansion in everyday life.
Describe the difference between linear, area, and volume expansion.
Explain why gaps are left between sections of railway tracks.
Explain why glassware may crack when hot water is poured into it suddenly.
Explain why telephone wires appear to sag more in summer than in winter.
If the area of a metal plate is A₀ at temperature T₀, and the coefficient of area expansion is β, write the formula for the area at temperature T.
The formula for linear expansion is ΔL = αL₀ΔT. What does each symbol represent?
What is meant by thermal expansion?
