During thermal expansion, obviously the object's density has to expand. The question is, How? Well, during this process, the object has to be placed in the temperature completely opposite of itself. For example, the cold jar's lid got bigger and allowed the jar to slide open, when placed under hot water. The lid was cold at first but when the hot water was added it expanded, allowing the jar to pop open. So according to my research, the density of a object expands by placing it under the opposite temperature. That explains why the jar lid got bigger when placed under the opposite temperature.
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Great explanation and examples. Has topic sentence and conclusion sentence. 3.
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