... mgis the mass of the gas in the bulb; cpg, the specific heat of the gas; mw,themass of the wall of the bulb; cpw, the specific heat of the wall; hf, the heat transfer coefficientbetween the ... temperature of the person is 30◦C. The convectioncoefficient from the surface of the person is 5 W/m2 ◦C. What is the effect of radiation if the emissivity of the surface of the person is ... surfacearea of the metallic part in contact with the gas; hg, the heat transfer coefficient of the gas to the wall; Ag, the surface area of the gas in contact with the wall; hw, the heattransfer...