Coffee houses frequently serve coffee in a paper cup that has a corrugated paper jacket surrounding the cup like that shown here. This corrugated jacket:
(a) Serves to keep the coffee hot.
(b) Increases the coffee-to-surrounding thermal resistance.
(c) Lowers the temperature where the hand clasps the cup.
(d) All of the above
(e) None oftheabove.
FIGURE P3–239
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