Why does it matter? heat & changes in temperature wrap-up question 1: electrical power in southern california costs about 18 cents per kwh. if you have to heat up 1 l of water to cook some pasta, how much does it cost you to bring the water from 22 c up to 100 c? (useful conversions: 1 ml -1g of water, and 1 kwh-3,600,000 j) how would the cost compare to the same temperature change of the same mass of oil instead? wrap-up question 2: how does the thermal conductivity of human skin compare to that of metal? use your results from part 3 and ideas from part 4 to justify your answer student wrap-up worksheet | page1 lab #9 question 3: why would it be more expensive to heat or cool a building made with is of glass compared to one built of drywall? use thermal conductivity to justify your answer