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O que (quem) é extravehicular activity - definição
Extravehicular activity
Extravehicular activity (EVA) is any activity done by an astronaut outside a spacecraft beyond the Earth's appreciable atmosphere. Normally, the term applies to what has been termed a spacewalk outside a craft that is orbiting Earth (such as the International Space Station).
activity
WIKIMEDIA DISAMBIGUATION PAGE
Activities; Inactivity; Activity (disambiguation)
(activities)
Frequency: The word is one of the 1500 most common words in English.
1.
Activity is a situation in which a lot of things are happening or being done.
...an extraordinary level of activity in the government bonds market.
...the electrical activity of the brain.
N-UNCOUNT
2.
An activity is something that you spend time doing.
You can take part in activities from canoeing to bird watching.
N-COUNT
3.
The activities of a group are the things that they do in order to achieve their aims.
...a jail term for terrorist activities...
N-PLURAL: with supp
Thermodynamic activity
MEASURE OF THE EFFECTIVE CONCENTRATION OF A SPECIES IN A MIXTURE
Activity (thermodynamics); Chemical activity; Effective concentration; Activity (chemistry)
In chemical thermodynamics, activity (symbol ) is a measure of the "effective concentration" of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution. The term "activity" in this sense was coined by the American chemist Gilbert N.
Exemplos do corpo de texto para extravehicular activity
1. AP A Nasa image shows Japanese astronaut Soichi Noguchi take a spacewalk in Discoverys first scheduled session of extravehicular activity.
2. It required balancing the substantial risks of conducting a spacewalk, or extravehicular activity, with doing nothing on the assumption that all is well.
3. One possibility would be for astronauts to attempt to repair the gap fillers during a spacewalk, referred to in NASA jargon as an EVA, for extravehicular activity.
4. The training refreshed their skills operating the Simplified Aid for Extravehicular Activity Rescue, or SAFER, jetpack that is worn on spacesuits.
5. "Our estimate is that around 2007 we will be able to achieve extravehicular activity by our astronauts and they will walk in space," Tang said.