What is the evidence of the change in the state of the cytoplasm in the cell, placed in water

What is the evidence of the change in the state of the cytoplasm in the cell, placed in water and a solution of common water then on the cell?

When we put a cell in a salt solution or pure water, some changes in the cell begin. The fact is that there must be the same salt level inside the cell and in the environment. If there is more salt in the environment, then the water leaves the cell and it decreases. Its functions cannot be performed. The same goes for the lower salt concentration. But then water from the environment enters the cell. She can burst from this. This is clearly seen in the example of human erythrocytes and saline solution.