The relationship between the rate of heat transfer per unit area \(\dot{q}_s\)=-(k∇T). Where, k is a scalar value of thermal conductivity and ∇T is the gradient of temperature. Which of these following is wrong according to the above equation?

• A. Heat transfer is different in different directions
• B. The rate of heat transfer depends upon the temperature gradient
• C. Heat transfer is in the opposite direction of increasing temperature
• D. k is the proportionality constant