# The Coffee Cooling Problem

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Freshly brewed coffee, immediately after being poured into the cup, has an approximate temperature of 185ºF (85ºC). The coffee becomes safe to drink after it cools to 143ºF (61.7ºC).

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Contributed by:S. M. Blinder (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

You can refer to two interesting websites discussing experiments performed by Cornell chemical engineers and by Maryland high school students. See also:

W. G. Rees and C. Viney, "On Cooling Tea and Coffee," *American Journal of Physics*, 56(5), 1988 pp. 434-437.

Snapshot 1: Add cream to cup 1 after 10 seconds.

Snapshot 2: Add cream to cup 2 after 300 seconds. It is ready to drink in 365 seconds.

Snapshot 3: Compare temperatures after 500 seconds.

## Permanent Citation

"The Coffee Cooling Problem"

http://demonstrations.wolfram.com/TheCoffeeCoolingProblem/

Wolfram Demonstrations Project

Published: March 7 2011