1356. The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as September 7, 2025 by Admin (ΔT)1/4 (ΔT)1/2 (ΔT)5/4 (ΔT)3/4 ✅ The correct answer is option D.