Question

The dimension of heat convection coefficient is-

• A. [ML²T-¹0-¹]
• B. [ML°T-30-¹]
• C. [ML°T-20-¹]
• D. [ML4T-20-¹]

Answer 1

Answer: (B)

[ML°T-30-¹]

Answer 2

The rate of heat convection is given by $Q = h A \Delta T$, where $Q$ is the heat transfer rate, $h$ is the heat convection coefficient, $A$ is the surface area, and $\Delta T$ is the temperature difference. The dimensions of $Q$ are $[ML^2T^{-3}]$, $A$ are $[L^2]$, and $\Delta T$ are $[\theta]$. Therefore, the dimensions of $h$ are $\frac{[ML^2T^{-3}]}{[L^2][\theta]} = [MT^{-3}\theta^{-1}]$.