Many factors have driven the development of roadway technology throughout history. What factor do you think likely had the greatest influence? Would you describe it as a social, scientific, or environmental factor? Use what you have read in this lesson to support your claim.

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.