Aheat flux meter attached to the inner surface of a 3-cm-thick refrigerator door indicates a heat flux of 25 w/m² through the door. also, the temperatures of the inner and the outer surfaces of the door are measured to be 7°c and 15°c, respectively. determine the average thermal conductivity of the refrigerator door. 0.0938 w/m. c

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.