two cylindrical rods of same length have the area of cross section in the ratio 2:1. If both rods are made up of same material, which of them conduct heat fast ?
Answers
Heat conductivity: The amount of heat through an unit cross sectional area of the material with the temperature gradient being perpendicular is referred to as heat or thermal conductivity.
Given:
Two rods have the same length and made up of the same material but the area of cross section is in the ratio 2:1
Reason:
Thermal or heat conductivity is directly proportional to it's area of cross section. As the area of the cross section increase, the thermal conductivity also increases.
Inference:
Hence, the cylindrical rod that has the twice the area of cross section will conduct heat faster.
As we know that the Heat conduction (the rate of heat flow) is directly proportional to area and inversely proportional to the length while everything else is identical.
As the two rods having same length and are made of same material, the cross-sectional area is 2x and x respectively according to the question.
The first rod would conduct heat faster than second one.