Name: Thermal Conductivity of Materials
Uploaded: 2019-07-19
Duration: 7 min 25 s
Description: You know, different materials have different Thermal conductivity. Let's understand the phenomenon of Thermal Conduction and how materials are useful on the...

Question

What is the meaning of the statement? $α = 19 \times 10^{- 6} K^{- 1}$ for brass. Write the mathematical expression of coefficient of apparent expansion. State its SI unit.

Accepted Answer

Coefficient of linear expansion does not depend on the unit of length. It depends only on the unit of temperature.

$Coefficient of linear expansion = \frac{Increase in length}{Original length \times Rise in temperature (in ° C)}$

Coefficient of linear expansion of brass is $α = 19 \times 10^{- 6} K^{- 1}$ . It represents that the length of an brass rod of initial length $1 cm$ or $1 m$ increases by $0.000019 cm$ or $0.000019 m$ on increasing its temperature by $1 ° C$ or $1 K$ .

The coefficient of apparent expansion $(γ_{a})$ of a liquid is equal to the apparent increase in volume of a liquid per unit original volume per degree rise in temperature.

$γ_{a} = \frac{Apparent increase in volume}{Original volume of liquid \times Rise in temperature}$

Its SI unit is $K^{- 1}$ .

What is the meaning of the statement? $α = 19 \times 10^{- 6} K^{- 1}$ for brass. Write the mathematical expression of coefficient of apparent expansion. State its SI unit.

Important Questions on Thermal Phenomena

Learn and Prepare for any exam you want !

What is the meaning of the statement? α=19×10-6 K-1 for brass. Write the mathematical expression of coefficient of apparent expansion. State its SI unit.

Important Questions on Thermal Phenomena

Learn and Prepare for any exam you want !

What is the meaning of the statement? $α = 19 \times 10^{- 6} K^{- 1}$ for brass. Write the mathematical expression of coefficient of apparent expansion. State its SI unit.