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2. Neutral buoyancy - Wikipedia

   en.wikipedia.org/wiki/Neutral_buoyancy

   Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing 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 is less). An ...

3. Neutral Buoyancy Laboratory - Wikipedia

   en.wikipedia.org/wiki/Neutral_Buoyancy_Laboratory

   The Neutral Buoyancy Laboratory (NBL) is an astronaut training facility and neutral buoyancy pool operated by NASA and located at the Sonny Carter Training Facility, ...

4. Archimedes' principle - Wikipedia

   en.wikipedia.org/wiki/Archimedes'_principle

   The sum force acting on the object, then, is equal to the difference between the weight of the object ('down' force) and the weight of displaced liquid ('up' force). Equilibrium, or neutral buoyancy, is achieved when these two weights (and thus forces) are equal.

5. Buoyancy - Wikipedia

   en.wikipedia.org/wiki/Buoyancy

   Buoyancy also applies to fluid mixtures, and is the most common driving force of convection currents. In these cases, the mathematical modelling is altered to apply to continua, but the principles remain the same. Examples of buoyancy driven flows include the spontaneous separation of air and water or oil and water.

6. Vacuum airship - Wikipedia

   en.wikipedia.org/wiki/Vacuum_airship

   Neutral buoyancy occurs when the shell has the same mass as the displaced air, which occurs when / = / (), where is the air density and is the shell density, assumed to be homogeneous. Combining with the stress equation gives

7. Neutral buoyancy simulation as a training aid - Wikipedia

   en.wikipedia.org/wiki/Neutral_buoyancy...

   Neutral buoyancy, properly planned and conducted, works because it is a realistic simulation of the physical requirements of performing a task in EVA. Comparison with reduced gravity aircraft [ edit ]

8. Supplee's paradox - Wikipedia

   en.wikipedia.org/wiki/Supplee's_paradox

   If a bullet has neutral buoyancy when it is at rest in a perfect fluid and then it is launched with a relativistic speed, observers at rest within the fluid would conclude that the bullet should sink, since its density will increase due to the length contraction effect. On the other hand, in the bullet's proper frame it is the moving fluid that ...

9. Neutral buoyancy pool - Wikipedia

   en.wikipedia.org/wiki/Neutral_buoyancy_pool

   A neutral buoyancy pool or neutral buoyancy tank is a pool of water in which neutral buoyancy is used to train astronauts for extravehicular activity and the development of procedures. These pools began to be used in the 1960s and were initially just recreational swimming pools ; dedicated facilities would later be built.