A general rule “Like dissolves like” is sometimes used to describe solubility. How can this rule be used to compare the solubilities of the following mixtures? a) Solubility of solid iodine in liquid water compared to the solubility of solid iodine in liquid toluene.
b) Solubility of solid sodium chloride in liquid water and in liquid toluene.

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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.