1: There is pressure on the side, but it is not big. You can imagine that you put the big gravel in the same thickness, but with fewer edges, so that a slope will be formed and will not touch the side glass. At this time, the edge glass will not be overstocked by big sand, which means that the pressure on the edge glass is only a component of the gravity of a small part of the gravel at the edge, and the strength is not great.

3. The pressure on the cylinder wall is only related to the water depth, and has nothing to do with whether there is anything else inside. 5. The bottom surface is the largest.

If the area of the side glass is the same as that of the bottom glass, the force on the side glass is 1/2,2,1. If the sand on the side wall touches the glass wall evenly, it is the water pressure plus the sand pressure at the position you choose.

2.) You can look at it this way.

3.) The same density *h*g (h is depth), 0, the pressure of water and sand in the fish tank on the periphery of the fish tank.

This kind of fish tank, please see the attached figure, has water and big sand, and the big sand has a high density. Excuse me.

1 If I continue to add large grains of sand, will the large grains of sand also exert pressure on the lateral wall of the fish tank (because it seems that the force of the large grains of sand should be downward, but is there lateral extrusion between the grains of sand)? How stressful is it?

In addition, if the big sand has no pressure on the side of the fish tank, can it be regarded as a part of the fish tank? The pressure on the side wall of the water tank is completely determined by the water pressure.

3 suppose case a: there is only water in the fish tank, but there is no big sand. I put a big stone in the fish tank, such as the big stone in the picture, so that the height of the fish tank water is 20 cm. Case B: There is only water in the fish tank, and the height of water is 20 cm. Is the pressure on the side wall of fish tank different in ab case, and how to calculate it?