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 ?
Now and further manipulator arm we mean weightlessness test bench arm, which is connected to STMS by six -component force and torque sensor.
Before the flight, Prof Hawking said his lifelong study of gravity and black holes had made him excited about experiencing, first hand, weightlessness and zero-gravity.
The motion of a satellite in a state of weightlessness is realised.
The company is planning to make sure its passengers experience G-forces and weightlessness, and spin them on a centrifuge through special aircraft flights prior to their actual spaceflight.
describes his experience with weightlessness on a zero-gravity airplane flight for "The Last Word" on page 104.
Seth was aboard a Zero Gravity Corporation plane that lets space enthusiasts experience the weightlessness once reserved for astronauts.
Those who buy the 'Art in-space' package will be whisked into the sky by a Boeing 727 aeroplane that will then drop suddenly for a minute at a time to simulate weightlessness.
Each flight will last three hours, Branson says, and passengers will experience weightlessness for about four minutes.
Varo's interest in scientific discovery, reflected even in the titles of her works, extended to cosmology, evolution, astronomy, and genetics: The Phenomenon of Weightlessness, Cosmic Energy, Weaving of Space and Time, Creation of the Birds, Discovery of a Mutant Geologist, Exploration of the Sources of the Orinoco River, Vegetal Architecture.
It is our intention to explore the limits of suspension and glazing technology in order to create an expression of weightlessness and visual movement appropriate to transit station design, the resultant forms and materials standing in stark contrast to the heavy concrete and masonry buildings of [Boston's] City Hall Plaza, and providing an icon of new public transportation architecture," says Brian Thomson, president, Thomson Design Associates, Boston.
During the flight, the Columbia astronauts conducted 90 scientific experiments on space communications, the global climate, and the effects of weightlessness on the human body.