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the station hosts a collaborative

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experiment that has been operating on

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station for more than five years and

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while the French Space Agency is the

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lead for this experiment it involves

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American investigators and scientists

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from many other countries d click

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continues to send back data allowing us

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to learn how various materials change

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from solid to liquid to gas and then

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back again on the molecular level the

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microgravity environment in space allows

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investigators to study fluid processes

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that are difficult and sometimes

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impossible to observe here on earth

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Tracy McMann a public affairs officer

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with the station's payload operations

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integration Center there at the Marshall

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Space Flight Center in Huntsville

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Alabama spoke recently with D clicks

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mission manager from the French Space

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Agency the name of the experiment is D

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click it stands for device for the study

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of critical liquids and crystallization

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the click is a facility dedicated to the

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study of transparent media it's a kind

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of furnace in which one can put the

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media he wants to study for example we

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have studies on supercritical fluids or

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solidification of transparent media it

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is onboard the space station since 2009

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and working since then

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a typical simple material that is being

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studied and on own body click is the

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water and we are studying what are the

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critical fluid because when you heat

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water at very high temperature which is

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close to 400 degree C it it becomes

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supercritical

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which is a kind of mix between the fluid

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and in gas state it's a kind of gas that

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waits like a fluid and when you perform

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that kind of study on the ground it is

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very difficult because as it is a gas

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that weight recovery

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it is highly compressive and you cannot

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have a whole cell which is in a

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supercritical State for example and

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under microgravity as there is no weight

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you

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can study it very precisely and for

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example the the measurement of the

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critical temperature of water that we

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perform on board a click is the most

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precise ever measurement of this

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temperature when you are above the

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critical temperature the water is able

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to break the hydrocarbon ik chains of

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materials and so you see that you can

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recycle material by injecting material

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into supercritical water

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the main application for this is to to

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help recycling organic media which is a

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basically waste during long-duration

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manned mission so this is one of the

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application of the click but there are

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several daughters like solidification

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studies for example the objectives of

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performing that kind of experiment in

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microgravity is to get rid of gravity of

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course because when you have gravity you

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have induced phenomenons like convection

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for example that can hide some of the

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phenomenons that occur in education for

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example the ISS is the is the right

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place for for our experiments for three

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main reasons the first is that it gives

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us access to long-duration microgravity

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which is really needed for our

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applications the second reason is that

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we are able to launch and return

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Hardware from and to the International

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Space Station and to refurbish this at

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wire and so we have access to multiple

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experiments with only one payload and

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and the third reason is that onboard the

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ISS we can store several up several

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experiments several insert that exchange

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it inside the cake for the time being we

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have three inserts that have been

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developed to with the click for each

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insert we have a team of scientists and

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in each team we have both american and

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french scientists so for example for the

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high-temperature insert the dedicated to

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a supercritical water studies we have

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scientists from Green Research Center in

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in Cleveland Ohio and when the French

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scientists are located in Bordeaux

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France we have developed some tools that

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give the scientists the opportunity to

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follow in real time the experiments from

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the Arabs they only need an internet

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browser and they connect to the web

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server and they see in real time the

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evolution of the experiments the

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parameters and the images and so on

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more information on D click can be found

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on the French Space Agency website at

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Caen s dot fr and search for D click the

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ECL I see if you're not fluent in French

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you can click on the British flag in the