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Why does a piece of water melon stay cool for a longer time than sandwiches when both of them are taken out from the refrigerator on a hot day?
Wiki User
∙ 12y ago
Well, a watermelon has a much higher specific heat than a sandwich. This is because Water (H2O) has an unusually high specific heat, and the watermelon contains much more water than the sandwich. The higher the specific heat of an object the more calories it takes to increase its temperature, this applies to cooling as well. So, a watermelon will take longer to get cold, but it will stay cool longer.
Another factor is the surface area in comparison to each objects mass. The Watermelon, in a sense, insulates the temperature of the cooler.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe water melon has more water in it - and water has one of the highest heat capacities known. So the melon can soak up a lot more energy than the sandwich for a similar change in temperature.
Wiki User
∙ 11y agoThere is two reasons this may be so.
First if both objects are wrapped in plastic wrap. The sandwich might require less heat to raise the temperature.
OR
Second if they are both unwrapped, the watermelon has a higher moisture content and the action of evaporation of that moisture cools the watermelon more than the sandwich.
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