.Nitrogen from a gaseous phase is to be diffused into pure iron at 669 °C. If the surface concentration is maintained at 1.0 wt% N, what will be the concentration (wt%) 0.9 mm from the surface after 6 hours? Given: Qd = 58 kJ/mol and %3D Do = 6.2 x 10-7 m2/s.

A thermal evaporator is used to deposit aluminum. The aluminum charge is maintained at a uniform temperature of 1100 o C. If the the vapor pressure of aluminum is about 1x10-3 torr at that temperature, calculate the evaporation rate of aluminum?

2. Based on the illustration given, the increase in stress concentration factor would depend on what factors? P b

Pre-lab 8: Cold Engine The experimental setup for this week's lab consists of a syringe connected to a metal can (reservoir), a cold bath (water - ice mixture) and a "hot" bath (water at room temperature). A schematics of the syringe - reservoir system is shown below. Plunger of mass m Filled with gas (air) Syringe of volume Vcor VH - Volume Vo includes tube + Metal can -Metal can submerged in water of temperature Тс or TH. Tube Stopper Figure 1: Schematic of the syringe - reservoir system. The syringe is essentially a glass cylinder fitted with a movable piston (plunger). The markings on the syringe indicate the volume of gas in the syringe, but do not include the additional, unknown volume, Vo, in the gas can and tubing.