Calculate the number of vacancies per cubic meter for some metal, m, at 829°c. the energy for vacancy formation is 0.81 ev/atom, while the density and atomic weight for this metal are 5.75 g/cm^3 (at 829°c) and 56.66 g/mol, respectively.

On a average work day more than work place firs are reorted

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.