Neutral buoyancy diver maintains neutral buoyancy by continuous correction, usually by controlled breathing, as neutral buoyancy is an unstable condition for a compressible object in a liquid. The mathematician Archimedes discovered much of how buoyancy works more than 2000 years ago. In his research, Archimedes discovered that an object is buoyed up by a force equal to the weight of the water displaced by the object. In other words, an inflatable boat that displaces 100 pounds (45 kilograms) of water is buoyed up by that same weight of support. An object that floats in the water is known as being "positively" buoyant.
A Treatise Concerning the Principles of Human Knowledge is a contradiction. Some philosophers, who know that ideas exist only in the mind, assume that there are external objects that resemble the ideas. They think that external objects cause internal, mental ideas. Objection: Berkeley's principles are not consistent with science and mathematics. The motion of the earth is considered to be true. But, according to Berkeley, motion is only an idea and does not exist if it is not perceived. Answer: To ask if the earth moves is really to ask if we could view the Earth's movement if we were in a position to perceive the relation between