Give reason for the following: 1. We apply grease to the glass joints in the distillation
process.

3. Water inlet in the condenser should be from down in
the distillation process.

4. What is the process used to purify a mixture of
heptanol (B. P. = 176 °C) and water (B. P. = 100 °C).

5.In one short paragraph describe what one would learn
from conducting such experiment and what are the
difference between simple distillation and

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.