The concept of "small"
It is difficult for us to use meaningful words to accurately clarify how small atom and molecules are. One ounce of water has about 1 trillion water molecules (H2O). If every molecule of water in an ounce of water is enlarged to the size of a golf ball, then all the ocean basins in the world cannot hold them.
In the process of decomposing matter, molecules are not the smallest constituent units, because each molecule is composed of smaller atoms. There are many facts that still surprise people who can imagine how big a tiny thing is in their mind. The smaller the biological volume, the greater the density of its own liquid. To understand this more easily, we use bacteria as an example: the exercise of bacteria in ordinary water is like humans swimming in liquid asphalt. However, since the bacteria do not know the difference between them, they can live comfortably and easily adapt to this thin environment.
Also for a non-scientific worker, it is difficult for him to find a reference to illustrate the tiny body size of a bacteria. Bacteria are the smallest independent living cells, with a single bacterial body reaching 1 million in a drop of water. Even with so many bacteria in a drop of water, they have enough space to come from in the activity.
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