| What statement is true concerning heat transfer rates by the heat transfer mode of natural convection? |
| A) Heat transfer rates are directly proportional to the difference in fluid densities which, in turn, is directly proportional to the temperature gradient. |
| B) Heat transfer rates are inversely proportional to the difference in fluid densities which, in turn, is directly proportional to the temperature gradient. |
| C) Heat transfer rates are directly proportional to the difference in fluid densities which, in turn, is inversely proportional to the temperature gradient. |
| D) Heat transfer rates are inversely proportional to the difference in fluid densities which, in turn, is inversely proportional to the temperature gradient. |
