Chapter 9

In chemistry class you have probably witnessed the phenomenon of "bumping" in a test tube (the explosive boiling that blows the contents of the tube all over the ceiling). Yet you have never seen this happen in a kitchen pot. Explain why not.

A \(1 \mathrm{~cm}\) diameter thin-walled tube carries liquid metal through saturated water at 1 atm. The throughflow of metal is increased until burnout occurs. At that point the metal temperature is \(250^{\circ} \mathrm{C}\) and \(h\) inside the tube is \(9600 \mathrm{~W} / \mathrm{m}^{2} \mathrm{~K}\). What is the wall temperature at burnout?