To calculate the cooling time of water to a desired temperature, use the following formula from Newton's cooling law:
t = -ln[(T final - T ambient)/(T initial - T ambient]/k
where:
T initial and T final — The starting and desired temperatures of water;
T ambient — The temperature of the room; and
k — A constant that contains information on the shape of the container and the physical characteristic of water. For a 300 ml cup with a diameter of 6 cm, k = 0.000655.
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