I can not figure this problem out and it’s extremely frustrating. Someone please do this for me so I can see how to do it. Write neatly please.

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

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the temperature of the gas, in k, not celsius.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.