It floats or it moves. In either case the change occurs from zero buoyancy to zero gravity.Not dark matter , but the presence of water in motion beyond the floating.
from Wikipedia
date 2018
July 17
Neutral buoyancy is a condition in which a physical body's average density is equal to the density of the fluid in which it is immersed. The buoyancy offsets the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it's less). An object that has neutral buoyancy will neither sink nor rise.
Balance of forces on objects with negative, neutral and positive buoyancy
A neutrally buoyant diver does not need to fin to maintain depthIn scuba diving, the ability to maintain neutral buoyancy through controlled breathing, accurate weighting, and management of the buoyancy compensator is an important skill. A scuba 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.
Neutral buoyancy is used extensively in training astronauts in preparation for working in the microgravity environment of space. NASA and the Russian space program maintain facilities in which suitedastronaut trainees interact with mock-up space hardware, with the assistance of scuba divers. At the University of Maryland's Space Systems Laboratory, a neutral buoyancy tank is similarly used to evaluate the performance of prototype space robots.
from Wikipedia
date 2018
July 17
Neutral buoyancy is a condition in which a physical body's average density is equal to the density of the fluid in which it is immersed. The buoyancy offsets the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it's less). An object that has neutral buoyancy will neither sink nor rise.
Balance of forces on objects with negative, neutral and positive buoyancy
A neutrally buoyant diver does not need to fin to maintain depthIn scuba diving, the ability to maintain neutral buoyancy through controlled breathing, accurate weighting, and management of the buoyancy compensator is an important skill. A scuba 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.
Neutral buoyancy is used extensively in training astronauts in preparation for working in the microgravity environment of space. NASA and the Russian space program maintain facilities in which suitedastronaut trainees interact with mock-up space hardware, with the assistance of scuba divers. At the University of Maryland's Space Systems Laboratory, a neutral buoyancy tank is similarly used to evaluate the performance of prototype space robots.
Micro gravity is like zero buoyancy in relation to the motion of water in water when an object in it creates motion like currents that move just like Inertia does in space.
from Wikipedia
date 2018
July 17.
Weightlessness, or an absence of weight, is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces (from floors, seats, beds, scales, etc.). Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed zero-g, where the term is more correctly understood as meaning "zero g-force."
When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field were zero. In such cases, g-forces are felt, and bodies are not weightless.