weightlessness

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weight·less·ness

(wāt'les-nĕs),
The psychophysiologic effect of zero gravity, as experienced by someone falling freely in a vacuum (for example, astronauts in a stable orbit). A temporary state of simulated weightlessness can be achieved during powered flight within the earth's atmosphere by traversing an inverted parabolic curve where gravitational pull and centrifugal force cancel each other out.

weightlessness

Etymology: AS, gewiht + ME, les
a state of absence of apparent weight, as in being beyond the effects of gravitational force in space travel. See also space medicine.
A state in which there is no gravitational effect on a body or material
Physiologic effects Bone mineral loss, altered blood chemistries, weakened immune system, variable heart rate, arrhythmias, loss of skeletal and cardiac muscle mass and strength, increased urinary loss of nitrogen and phosphorus, motion sickness, and redistribution of fluids that are normally pooled in the lower torso and legs, resulting in a ‘fat face’

weightlessness

in horses induces osteoporosis if the period of weightlessness is long enough; in dogs the effects of weightlessness are confused with those of head-out immersion in water.
References in periodicals archive ?
The engineers plan to use the micro-gravity available in space as a way to isolate the effects of natural convection by comparing castings made on earth with those aboard the ISS.
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Scientists and engineers can study the effects of prolonged exposure to micro-gravity, conducting experiments related to astronomy, biology, chemistry, technology, and medicine.
Vice Chancellor IST Imran Rehman in his address said the institution was producing young professionals in the field of Aerospace and Communication Systems Engineering, and was providing most up-to-date research facilities in the country including on subject such as micro-gravity.
Dr Martin Castillo from Queensland University of Technology's (QUT) Science and Engineering Faculty, and researcher for the university's micro-gravity drop tower, said the special glass will be the first QUT project to be launched into space.
Research into human reactions to space conditions take place in space and in ground-based research that simulates micro-gravity.
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