How many pounds of steam are required to supply 500 EDR of radiation?

To determine the amount of steam required to supply 500 EDR (Equivalent Direct Radiation) of radiation, it is essential to understand the relationship between EDR and steam. The general rule of thumb in steam heating applications is that 1 pound of steam can effectively supply 1 EDR of radiation.

In this case, if you require 500 EDR of radiation, you would need 500 pounds of steam. This is based on the principle that each pound of steam transfers a specific amount of energy, which corresponds directly to the heating requirements of the radiation.

Therefore, the correct answer is that 500 pounds of steam are required to supply 500 EDR of radiation. This calculation highlights the efficiency of steam as a heating medium and demonstrates the straightforward conversion between EDR and steam weight in pounds.