Best Answer: the rate of diffusion is directly proportional to the concentration gradient. The greater the difference in concentration between two areas, the greater the rate of diffusion.
EPC-40: Electrical Plastic Conduit : Designed for normal duty application. EPC-80: Electrical Plastic Conduit : Designed for heavy duty application.
Enhancement and improvement costs. 1  A PVC conduit is essentially a long sleeve for the gas line pipe, which acts as extra protection against damage and gas leaks. 2  A steel casing pipe 1 is an additional pipe that fits around the gas line to protect it from leaks and damage.