Build and Test Heat Device · Middle School Physical Science

Middle School Physical Science Quiz

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A student built an insulated cup (foam walls 0.5 cm thick, plastic lid not sealed tightly, no reflective coating). Hot water started at

70^\circ\text{C}

and the temperatures were: 0 hr:

70^\circ\text{C}

1 hr:

58^\circ\text{C}

2 hr:

48^\circ\text{C}

3 hr:

40^\circ\text{C}

Criterion: keep

\ge 60^\circ\text{C}

for 3 hours. Which is the best evidence-based reason this design failed?

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