ABSTRACT
In the human eye-scale, fluids are continuous material. Fluid is not like the sand which can be broken down into “reasonably” countable elements. We can go deeply into the molecular level of fluids, but if you think of how many molecules are there inside a small cup of water and how much memory you have on your computer, you will soon realize that it is impractical even trying to simulate fluids from the microscopic scale. Thus, we need to approximate the real physical world with finite data points, just like the painter draws his masterpiece with many, but a measurable number of dots.
