Question 1-19
A student was trying to determine how many ice cubes would be needed to keep a glass containing 250 mL of water under 15°C for a minimum of 30 minutes. The student placed
varying numbers of ice cubes in different cups and recorded the time it took for the water to warm up to 15°C. The student then performed the same experiment each day for a
week. Why did the student perform multiple trials of the same experiment?
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The experiment involving the determination of the number of ice cubes required to keep the temperature of the glass under 15 degrees Celcius, the following things have to be kept in mid:

The temperature of the surroundings
The initial temperature of the glass
The number of ice cubes added to the water in the glass

In order to keep into consideration the changing environmental temperatures (which is a variable in the experiment), the experiment had to be conducted daily to get accurate results keeping into consideration all the factors.

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