After the oxygen check, the next thing to look at is fresh water.

On Mars, fresh water and oxygen are equally precious, and if there is a lack of fresh water, Tang Yue will not live for more than three days.

At Kunlun Station, oxygen and fresh water are produced in circulation, and the two are closely related and cooperate with each other.

Life support systems produce oxygen by electrolysis of water, followed by hydrogen and carbon dioxide to produce fresh water.

All wastewater is recycled, including water vapour, urine and feces, and the toilets at Kunlun Station are very powerful suction machines that can extract all the water molecules that can be absorbed.

The urine is dried directly into urea and uric acid crystals, and the feces is dried like sand before being vacuum-packed and brought back to Earth.

The old cat often said to Tang Yue that the soup in your bowl was mixed with your Xiang ten minutes ago.

It's just my own Xiang.

The old cat also said that the soup in your bowl was mixed with Lao Zheng's Xiang ten minutes ago.

Lao Zheng is one of the members of the expedition team, a greasy middle-aged man, and one can pollute the air of the entire Kunlun station, so when he goes to the toilet, everyone else will go out to take refuge.

This old man can't bear it.

"You alone consume an average of 1.56 kilograms of drinking water per Martian day, about 1.20 kilograms of water in rehydrated food, and 0.92 kilograms of electrolyzed water are required to produce oxygen."

The old cat is budget-conscious.

"In other words, you need to consume an average of 3.68 kilograms of fresh water a day, and in addition, you need to take a shower once a week, which consumes about 5 kilograms of fresh water."

"What about recycling?" Tang Yue asked.

"The water recycled mainly comes from urine, feces, respiratory, sweat and other condensations." The old cat replied, "You produce an average of 1.49 kilograms of urine a day......"

Tang Yue was stunned for a moment, "Do I have so much urine?" ”

"You don't know how much urine you have yourself?" The old cat said, "This is the statistics of the computer, and you have to produce about 120 grams of feces every day on average. ”

Tang Yue was silent for a few seconds.

"You don't have to tell me how much I poop every day, you say that I feel like a useless manure machine......"

"In addition, your daily breathing and sweating will produce about 1.6 kilograms of water vapor, and other metabolic activities will produce a total of 0.34 kilograms of water." "The maximum recovery rate of the water recycling system at the Kunlun station can reach 96 percent, which means that the Kunlun station can produce 3.4 kilograms of clean fresh water per day. ”

"I consume 3.68 kilograms of water a day, but can only regenerate 3.4 kilograms of water?" Tang Yue asked, "0.28 kilograms missing?" ”

The old cat nodded.

Tang Yue frowned.

Less than 300 grams of water, and less than a 500 milliliter bottle of mineral water.

If it was on Earth, then he didn't care at all, and now Tang Yue finally knew what fresh water was life.

This difference of less than three hundred grams will directly determine how long he has the rest of his life.

Consuming 3.68 kilograms and replenishing 3.4 kilograms, the fresh water in Kunlun Station will continue to be lost at a rate of 280 grams per day, and the total amount of fresh water reserves will gradually decline.

When the fresh water in the station is completely exhausted, Tang Yue will be finished.

"How much water do we have?"

"1200 liters." The old cat replied, "That's 1,200 kilograms." ”

"According to the rate of losing 300 grams per day, so much water can only be used ......," Tang Yue calculated in his heart, "Four thousand days." ”

"This is just the most ideal situation, in fact, it will definitely take less than 4,000 Martian days, and you are not the only one who needs to consume fresh water on the Kunlun station, and with the aging of the water recycling and purification system, the recovery efficiency will continue to decrease." "I think if this water can be used for 3,000 Martian days, it would be a very ideal situation." ”

Three thousand days.

Eight Earth years of time.

Tang Yue squatted on the floor, spread out the maintenance manual of Kunlun Station in front of him, and sighed.

"If I can really live another eight years, it will be considered a face-saving God, and I am very content."

The earth is gone, and he can live for another eight years, isn't that earned? Lord Yama is very face-saving.

"It's too early to say that you have eight years to live." The old cat unceremoniously punctured Tang Yue's dream, "Next, let's count the food." ”

Food is the third material that needs to be counted, if there is not enough oxygen, Tang Yue will suffocate to death, if there is not enough fresh water, Tang Yue will die of dehydration, and if there is not enough food, Tang Yue will starve to death.

All of them are deadly killers.

Tang Yue laboriously moved out all the packed food.

Food and oxygen and water are different, these things are large, heavy and take up space, and most of them are left over from the previous round and this round.

For some reason, people don't have a good appetite on Mars, their taste buds are numb, and no matter how delicious things are, they taste the same as chewing wax in their mouths.

So Tang Yue and the others all forced themselves to eat, barely eating to the rated amount.

There is still a lot of food left over from the last round of supplies, mostly ready-to-eat and semi-processed foods.

You don't have to eat toothpaste like the early astronauts did on Kunlun Station, there are dinner plates, ovens and microwave ovens, and because of the gravity of Mars, you don't have to worry about utensils and food floating around, so it is much more convenient to process food on Kunlun Station than on ISS, and the kitchen can almost follow the design on Earth.

Theoretically speaking, the equipment and tableware in Kunlun Station are complete, and there is no technical problem in making a full seat for the Manchurian and Han people.

Just to save water and electricity, most of the food delivered is still semi-finished products that have been preserved and frozen, and only need to be cut and heated simply if you want to eat.

What's more, fresh fruits and vegetables can't be transported at all, and it takes a year to get from Earth to Mars, and everything should be rotten.

Tang Yue opened the boxes one by one.

"Beef, vacuum-packed, preservative-cured, shelf life of two years." Tang Yue took out a large piece of beef from the box and put it on the shelf, "Twenty kilograms, with other things, it should be no problem to eat for two months, right?" ”

The old cat nodded.

"Chicken breast, cured with preservatives, with a shelf life of two years." Tang Yue took out a large bag of chicken breast from the box again, "Twenty kilograms, you can eat for two months." ”

Large portions of ingredients such as large pieces of beef and chicken breast are basically canned foods in flexible packaging, which have been sterilized at high temperatures on the earth, and contain a certain amount of water, and finally vacuum sealed in flexible packaging.

They're essentially cans, but because they're soft, they're not as heavy as metal cans and don't take up a lot of space.

These meats can theoretically be eaten as is, but they are originally used for cooking, for example, as an ingredient in frying steaks...... The resident population of Kunlun Station is six people, and all the food is prepared according to six people, and twenty kilograms of beef is actually not enough to eat for a week.

But now Tang Yue is the only one left, and he can eat his belt for two months.

Tang Yue took out all the large portions of ingredients in the box and piled them on the shelves and on the floor.

"How long will this food last you?" The old cat asked.

Tang Yue estimated slightly, "If you don't consider the quality of life, you will definitely not starve to death within a year, right?" ”