Science about space

Question

Why are the space food dehydrated and refrigerated ?

Water is added into the food before they cane eaten. Where is the water added into the food comes from ?

Answer 1

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Why are the space food dehydrated and refrigerated ?

Foods must meet a number of criteria to be considered fit for space; first, the food must be physiologically appropriate, specifically, it must be nutritious, easily digestible, and palatable. Second, the food must be engineered for consumption in a zero gravity environment. As such, the food should be light, well packaged, quick to serve, and easy to clean up (foods that tend to leave crumbs, for example, are ill-suited for space). Finally, foods must require a minimum of energy expenditure throughout their use, i.e., they should store well, open easily, and leave little waste behind.

Water is added into the food before they cane eaten. Where is the water added into the food comes from ?

Water is the output of burning of fuel( Liquid Hydrogen and Liquid Oxygen). So space ship have no need to store water for whole trip.

2008-03-31 12:45:34 補充：

Firstly, some water will condense on the wall of the end of spaceship. We can get it back.

Also fuel cells combine hydrogen and oxygen to create electricity and the water.

Source(s): , http://en.wikipedia.org/wiki/Space_food

Answer 2

1

to avoid decaying of food

dehydrated--->no water---. bacteria cannot live

refrigerated-->low temperature--->bacteria are inactive

2

anywhere as there is drinking water for the astronaut

i)they bring some water into the space for drinking otherwise they die

ii)leached urine from astronaut(they do drink that!!!)

2008-03-28 17:20:45 補充：

下面果位, d水唔噴出黎咁係乜野力推火箭向上?

2008-03-28 18:02:34 補充：

copy cat-.-

http://en.wikipedia.org/wiki/Space_food

see Processing

2008-03-31 21:58:30 補充：

係地球度嘖咀有2000度以上

你的意思係上到太空後再收集番d水?

yes fuel cells produce water which can be used, 但太空人的確會帶小量水上太空作飲用