Explain the mixture was gently stirred as the ice melted

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Question- An experiment was done in order to determine the heat of fusion of ice. A student used a calorimeter consisting of a polyesteryne cup and a thermometer. The cup was weighed, filled halfway up with warm water, and then weighed again. The temperature of the water was measured and some ice cubes from a 0 degree C bath were added to the cup. The mixture was gently stirred as the ice melted and the lowest temperature reached by the water was recorded. The cup and its contents were weighed again. The purpose of weighing the cup and its contents at the end of the experiment

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