Then give me one good argument instead of a video with 200 shitty. The physics of water isn’t to “find and maintain its level. For starters, that is a rather vague description: what determines the level that it comes to and how does it find it? In reality, water, and liquids in general are shaped by gravity and other forces to the shape which takes the lowest amount of energy. The levels in the barometer are different because the trapped air in the closed section is at a higher pressure than the atmosphere to which the air in the neck is exposed. While there would be less energy from gravity if both levels were the same, it would take more energy to push back against the higher pressure air and the total energy of the water would increase. In fact, if you take water into a zero-g environment (whether by parabolic flight or going to space) and squirt it into the air, it will form a sphere. The water doesn’t flatten out and “find its level” because the shape that has the lowest energy due to the interactions of the water molecules is a sphere. This is also why rain falls in drops and dew forms in beads. Since the gravity of Earth pulls everything towards its center, the gravitational potential energy is equal along the surface of (approximately) a sphere centered at the Earth’s center of mass, with a sphere of a small radius having a lower energy that one with a larger radius. So to have the lowest energy, water would try to reach the smallest possible radius, so assuming that gravity is equal all around the Earth the surface of the water would come to the same distance from the center of the Earth. Since you and the guy in the video did not include any sources or experiments to show that the surface of water is actually flat, I cannot really say a whole lot more, except that the tilt would not affect the surface of the water, neither would the wobble, really, since it takes so long, and the speed of the Earth travelling through space also would not change it at all, so yeah… not really sure why he mentioned those.