Question

Insulating materials are rated by their _____. specific heat heat index r-value temperature resistance

Answer 1

Answer: Option (c) is the correct answer.

Explanation:

The difference in temperature when per unit of heat flux is required by one unit of heat flux between a barrier of warmer and colder surface present in steady state condition is known as R-value.

Mathematically,       R-value = $\frac{\text{Temperature difference}\times \text{Area}\times \text{Time}}{Heat loss}$

Thermal resistance of insulating products or materials can be known with the help of R-value. As more is the r-value of a substance more will be its insulating power.

Therefore, we can conclude that insulating materials are rated by their r-value.

Answer 2

That would be the R-value