Astronauts drink 4 Jin of water every day in space. Where do they drink water from?

Drinking water in space, like space food, is packed in sealed bags. Instead of drinking water, astronauts shoot water into their mouths. When drinking water, the astronaut connects his mouth with the beverage container through a pencil-thick straw, and applies a certain pressure through the air pump, so that the beverage is continuously injected into the astronaut's mouth, but the strength cannot be too great, otherwise the water will be squeezed into space and become foggy. All objects in space are in weightlessness. In weightlessness, water can't flow down like it does on the ground. It is the same if a cup filled with water is placed up and down. The water in the cup will not flow out by itself, and drinking water is also very troublesome.

Astronauts need to drink water, and it is very simple to drink water only in a special way on earth. But in space, astronauts are in weightlessness. If you want to drink water, you must use special methods. For example, through a water storage tank or bagged water. Water can be produced in space. The manned spacecraft uses hydrogen-oxygen fuel cells, which can efficiently convert chemical energy stored in fuels and oxidants into electric energy, and at the same time produce by-products, namely water, which can be turned into drinking water after a series of procedures such as filtration and disinfection.

Besides this method, astronauts can also recycle water resources. The water vapor exhaled by astronauts is recovered by condensation, purified and filtered. Urine can also be separated by negative pressure drainage to realize urine collection and then purified into drinking water or domestic water.

According to statistics, each astronaut needs to consume about 18.5 liters of water every day, including cold water 10 liter and hot water 8.5 liters. At the beginning of exploring the universe, it was used to bring water from the ground to space to solve the problem of drinking water for astronauts. Although this method has low cost and good effect, it needs to design a huge reservoir. Later, the number of astronauts increased, and this method was gradually eliminated.