weightlessness

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weightlessness Condition experienced by an object on which the force due to gravitation is neutralized. Such an object is said to have zero gravity and no weight; it floats and cannot fall. Weightlessness can be experienced in space and during free fall. The adverse effects on the human body of prolonged weightlessness (called hydrogravics) include decreased circulation of blood, less water retention in tissues and the bloodstream, and loss of muscle tone.

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