Let's talk about the pool first. Cups, buckets, tanks, pools, and the cups, buckets, pools, and ponds here share a common feature. Their basic function is to hold water, but the difference lies in the volume and size. Water is a liquid with a fundamental property that it can flow from high places to low places. The basic knowledge is,

　　People may not have thought that the pool was originally empty, and the water in the pool was poured in by humans. A hole was drilled at the bottom of the pool, and the water in the pool would eventually drain. What scientific principles are involved in this process?

　　a) An empty water pool requires an empty volume to hold water;

　　b) Water cannot enter the pool by itself, it is poured into by humans;

　　c) Only with the presence of water pressure can water flow from high places to the ground.

　　Similarly, a battery has a capacity to hold electricity. Originally, the battery was also empty and had no electricity. Electricity is charged by humans, and the battery can discharge because there is a voltage difference inside the battery.

　　A water pool is a physical principle that holds liquids, and water has a molecular structure; Batteries are based on the principles of electrochemistry, which are charged ions smaller than molecules.

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