6 - Coefficient of Linear Expansion

Question 1

is a number which indicates the change in length per unit
length per degree of temperature change.

is a characteristic property of the material

Answer 1

coefficient of linear expansion (α)

Question 2

Let the steam flow freely through the linear expansion apparatus until the thermometer reading becomes _______.

Answer 2

constant

Question 3

Why is it that the rod no longer expands when it reaches a constant temperature?

Answer 3

Once it achieves a constant temperature, thermal equilibrium is achieved and the rod stops expanding. When the temperature stabilizes, no more heat is transferred into the rod, therefore there is no more thermal energy to encourage expansion.

Question 4

Why is it necessary to know the coefficient of linear expansion of solids?

Answer 4

The coefficient of linear expansion is important because it helps us predict how materials will change with temperature. This is useful in construction, where it prevents damage to structures like buildings and bridges, and in manufacturing, where it ensures parts fit together properly. Without this, materials might crack, warp, or even break when temperatures change.

Question 5

Give examples of solids that expand or contract due to temperature changes?

Answer 5

Plastics, metals, wood, concrete, and aluminum

Question 6

Brass (α)

Answer 6

1.9 x 10^-5

Question 7

Copper (α)

Answer 7

1.7 x 10^-5

Question 8

Aluminum (α)

Answer 8

2.4 x 10^-5

Question 9

Steel (α)

Answer 9

1.3 x 10^-5