Thermal Properties Of Matter

The relation between Celsius scale and Fahrenheit scale is as derived below:

parts of Celsius scale parts of Fahrenheit scale
1 part of Celsius scale
parts of Fahrenheit scale Hence, Or
Given,

The quantity of heat following through a slab in time t,

For same heat flow through each slab and composite slab, we have


or
(say)
So,
and
or
or

Given
So,