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An open system can exchange both matter and energy with the surroundings whereas a closed system has a fixed amount of matter but it can exchange energy with the surroundings. Examples of open systems can be automobiles or the human body. For the human body, we actively interact with our environment, which results in changes to both the environment and us. For example, we eat to acquire energy and our food source is considered to be a factor of our surrounding. An example of a closed system can be a saucepan with a lid on. By putting a lid on the saucepan, matter can no longer transfer because the lid prevents the matter from entering the saucepan and leaving the saucepan.
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