QQuestion
Define the coefficient of volume expansion of a solid and write its mathematical form. [1 + 2]
OR
Give one example of each of the thermal expansion of solid, liquid and gaseous substances from everyday experience. [1 + 1 + 1]
✓Answer
Definition: The coefficient of volume expansion of a solid is defined as the fractional increase in its volume per degree rise in temperature.
Coefficient of volume expansion (γ) = V_2 - V_1\over V_1(θ_2-θ_1)
OR
Examples of Thermal Expansion
- Solid: Railway Tracks – Railway tracks expand during hot weather, which can cause them to bend or warp if not properly spaced.
- Liquid: Thermometer – The mercury in a thermometer expands and rises when heated, allowing it to indicate temperature changes.
- Gas: Inflated Balloon – A balloon filled with air expands and may burst when heated, as the air inside takes up more space due to thermal expansion.
Related Questions
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How many types of thermal expansion coefficients are there for a liquid? 0 1 2 3
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Find the length of an iron rod at 110°C if at 10°C, the length of the rod is 20 cm. [Volume expansion coefficient of iron = 36 × 10⁻⁶ /°C]
Define the coefficient of apparent expansion and the coefficient of real expansion of a liquid. Write the relationship between them. [2+1]
Explain the statement: “The coefficient of linear expansion of iron is 12 × 10⁻⁶ /°C”. Give an example of volume expansion of a liquid due to the application of heat. [2+1]
Write whether the following statement is true or false : The value of coefficient of linear expansion of solid is the same in celsius scale and in Kelvin scale. OR Arrange diamond, iron and silver in the order of decreasing thermal conductivity.
What is the unit of conductivity? mho. meter -1 ohm. meter -1 mho. meter ohm. meter
The coefficient of thermal conduction depends on: (a) The difference in temperature between the two ends of the conductor (b) Property of the material of the conductor (c) The length of the conductor (d) The area of cross-section of the conductor
Why are there gaps at regular intervals between consecutive rails in a railway track? State the relation between linear expansion coefficient (α), superficial expansion coefficient (β) and volume expansion coefficient (γ). [2+1]
Write whether the following statement is True or False: If coefficient of linear expansion of iron is 1.2 × 10⁻⁵ /°C, then coefficient of cubical expansion of iron is 3.6 × 10⁻⁵ /°C.
Write whether the following statement is True or False: Which physical quantity has the unit W m⁻¹ K⁻¹?
The SI unit of thermal conductivity is: (a) W m⁻¹ K⁻¹ (b) cal m⁻¹ °C⁻¹ (c) W m K⁻¹ (d) W m² K⁻¹