Arigid tank, initiallyevacuated,
develops a small hole, and air slowly leaks in from thesurroundings
at a mass flow rate proportional to the pressuredifference in the
tank and of the surroundings. using the ideal gasmodel for air, and
assuming isothermal conditions in the tank, derive an expression for
the pressure in the tank as a function oftime.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)

Explain in your own word the concept of a solid solution, in alloys, and how it can be created.