(a) What happens to fluid flow when you decrease the radius of a fluidic channel by a factor of 100? Will it be more difficult or easier for fluid to flow? Why? Show all your calculations.
(b) Consider there are two similar solid objects A and B. They are made of the same material. Suppose the size of object A is decreased by 100 times. Both objects are put in a hot oven for 10 minutes, and then taken out at the same time. Which object will cool down faster and why? Show all your work.
(c) What is a drawback of molded PDMS surfaces? How can you address it?