Saturated steam at 300°c is used to heat a countercurrently flowing stream of methanol vapor from 65°c to 260°c in an adiabatic heat exchanger. the flow rate of the methanol is 6500 standard liters per minute, and the steam condenses and leaves the heat exchanger as liquid water at 90°c. calculate the required flow rate of the entering steam in m3/min. calculate the rate of heat transfer from the water to the methanol (kw). suppose the outlet temperature of the methanol is measured and found to be 240°c instead of the specified value of 260°c. list five possible realistic explanations for the 20°c difference.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.