Doomsday: Humanity shrinks 100 times

Chapter 143 Simple Temperature Sensing Device

The idea of fishing was present in the minds of the original four members of Weiguang from the very first day.

Compared to developing new edible insects, fish is the preferred ingredient.

The reason I thought of fishing here is mainly because the conditions are right.

First, the water here is much shallower than that in the main river channel, and the river channel is narrower.

The method of fishing cannot be done by fishing, but by making a trap, which requires the river water to be shallow.

In addition, there must be a feasible salvage method, and the winch used for salvage before is the best.

That's why Lu Yuning came up with the idea of fishing in the harbor.

Of course, his target is not large fish, but fry.

This is one of the reasons why he considered making a fishing area in this stream.

There should be more small fish in the diving basin and the targets should be clearer.

Lu Yuning shared the above ideas with everyone.

"So, I want to explore this area to see if there are any suitable fishing areas. If I have a clear target, it will be much easier than fishing directly."

The four of them also understood his idea. Since there were conditions to open up a fishing area nearby, they must give it a try.

Now that they have seasonings, the ingredients need to be enriched, and everyone will definitely support this.

However, Lu Yuning actually had another idea. In addition to fishing, he wanted to try traveling by water.

After all, they now live by the river and their walking speed is extremely slow, so they might as well try to travel in the water.

Even if you want to leave the park in the future, it seems more convenient to move by boat.

However, it would be difficult to control if we tried it directly in the main river channel. The stream in front of us is a good place to try it.

Naturally, everyone was very supportive of this and decided to explore further down the stream.

The target area must meet two conditions: the water level must be mild and there must be conditions for the survival of aquatic organisms.

The five of them crossed mountains and rivers, and the surrounding scenery was similar.

Since we were walking along the river, we didn't have to worry about getting lost.

The five people explored along the river, and they were already feeling aesthetic fatigue when looking at the plants that blocked out the sun.

At this moment, everyone suddenly felt a bright light in front of their eyes, and the nearby plants disappeared.

What appeared before their eyes was an open space. Judging from the material of the ground, it should have been paved by humans.

There is actually an open space in this forest area, which seems to be a resting place.

The vegetation here is much sparser, and the sunlight shines through, making everything in sight suddenly brighter.

The river is much shallower here, and judging by its direction of flow, it should be heading out of the park.

This area was a corner, and there happened to be a pool of water. From their perspective, it looked like a lake with fish flickering in it.

Lu Yuning's eyes flashed. This is the best location for construction.

As long as we deal with the weeds on the river bank and set up a salvage device nearby, we should be able to catch fish.

"This is it." Lu Yuning observed the area and finally expressed his satisfaction.

Liu Rui thought for a moment and said, "If we're fishing here, then let's see if we can come from somewhere else tomorrow. It's a bit tiring to walk along the river. It seems like there should be a way to get here from this rest area."

Lu Yuning nodded in agreement.

The construction location of the fishing port has been temporarily determined.

However, if a fishing spot is set up here, traveling back and forth will definitely be a problem, as walking through the vegetation is really not very convenient.

So we still have to see how to get in from other routes, and this can only be left to Liu Rui and others.

Because we had to find a suitable fishing area, we didn't have time to explore the bird's nest that we had planned to explore.

Although they wanted to continue exploring, they had no choice but to return home after looking at the sky.

Next, they had to wait for Liu Rui and Xia Fei to thoroughly explore the area, and then Lu Yuning decided to temporarily finish the construction work at hand and come over to start the fishing-related construction.

However, we must make another trip to the stream entrance to bring back all the glass. This material is hard to come by and should not be wasted.

The five people's exploration this time was a complete success.

When everyone saw Wu Xiao take out the instant noodle seasoning packet from the space, they were naturally excited.

This package is several times larger than them, and it is almost inexhaustible for them. Finally, their taste will not have to be so bland in the future.

In addition, Wu Xiao also took out some rubber and glass that he had collected.

"If we have rubber and glass, we can try to make a real steam engine."

Zhang Xinyue looked at the two materials in front of her and said with some joy.

Lu Yuning nodded. This was the first thing he thought of.

The steam pumps they had made before could only control air pressure to pump water, but could not generate kinetic energy.

The main reason is that the production of the piston is quite demanding, and it must ensure both air tightness and a small friction coefficient.

So now that metals could be controlled, and with rubber materials available, a steam engine might be possible.

As for the function of this steam engine, Lu Yuning's first thought was to use it in conjunction with a winch.

It is quite difficult to salvage garbage by manpower alone, but it is much more convenient to use this mechanical device.

This makes it possible to salvage heavy objects, as it is inconvenient to dispose of garbage near the river.

In fact, after modifying the winch, they will become the lifting platform they are going to make next.

In addition, if the steam engine can be made more sophisticated, it may be possible to put it on a ship and realize water transportation in a true sense. However, this goal is still a bit far away.

Lu Yuning also told everyone about the preparations for fishing, and everyone was naturally full of anticipation.

After all, compared to eating insects, fish is more reliable.

Fishing sounds simple, but it is still difficult to actually do it.

This includes the method of trapping the cage, the actual location of the cage, how to place it, and how to salvage it, all of which require planning.

Lu Yuning decided to complete the construction of the shelter as soon as possible, and then start the construction of the fishing area.

There's actually not much work left on the shelter's expansion, just the meeting room and some decoration work.

In addition to this, there is the construction of lifting facilities and indoor temperature control systems, and the greenhouse can only be dealt with last.

Liu Rui and Xia Fei continued to explore the forest area and tried their best to draw a map of the entire forest area.

In short, there are a lot more things to do now, and we still have to do them step by step.

After receiving the seasoning packet, Zhang Qian went to study the new recipe with shining eyes. At this time, everyone was sitting in the restaurant waiting for the meal to start.

Then, as everyone was waiting, she served a plate of green food.

"Cold dish~" Zhang Qian seemed to enjoy everyone's anticipation, and happily put the newly unlocked food on the table.

Everyone first tasted it out of curiosity, and then began to gobble it up.

"Full marks"

"Thank you Sister Qian"

"tasty"

"."

Everyone commented on it, and it seemed that they were quite satisfied.

Lu Yuning also started eating without hesitation. This long-lost taste really made people feel like crying.

The next morning, everyone got up one after another.

After two days of construction work, everyone had already lost their initial enthusiasm.

They had lost interest in the repetitive and tedious work, and they had to admire Lu Yuning.

You should know that the shelter at the beginning was almost dug out by Lu Yuning himself.

It was a bit boring, but everyone still did not dare to slack off and prepared to continue the construction work.

Of course, everyone was still a little excited when they thought that they might have fish to eat after the shelter was completed, and their work enthusiasm was greatly enhanced.

There wasn't much expansion work left, and the conference room wasn't difficult either, so it was finished in less than a morning.

Although I really want to put some plants in for decoration, because the plants are too large, aerobic respiration at night will consume a lot of oxygen.

It had a completely negative effect on them, and they eventually had to give up.

The expansion of the shelter has been completed and it looks much more spacious overall. Looking at everyone's expressions, their joy is self-evident.

The remaining lifting platform and temperature control device are more difficult to install.

However, since she had brought back some alcohol before, Zhang Xinyue also had some ideas about the temperature control system.

The main reason is that alcohol has a higher expansion coefficient and is more sensitive to temperature than water.

It is perfect for measuring room temperature, but alcohol is also more volatile, so it will easily evaporate if exposed to air.

Zhang Xinyue finally decided to make a balancing device.

"The idea is this: at a moderate temperature, a temperature sensor, or thermometer, is used to create a balancing device. When the indoor temperature drops or rises, the alcohol in the temperature sensor expands or contracts, disrupting the balance. The heating device is then indirectly controlled by the device's ability to rotate."

Zhang Xinyue briefly explained her design ideas.

Lu Yuning looked at the sketch on the ground and found it relatively easy to understand.

It's probably a seesaw-like device, but the board is replaced with something like a thermometer.

When the alcohol in the thermometer expands due to heat, it naturally breaks the balance, thereby detecting the temperature.

However, when actually using it, it may not be as sensitive as imagined, and the actual area of their shelter is very small, and the temperature may change quickly, so the placement and balance threshold must also be considered.

However, at their current level, they can only do this roughly.

Lu Yuning nodded in understanding, then asked, "How do we turn this rotation into a switch for the heating device?"

"First, the rotation must be amplified through the gear ratio, and ultimately converted into the valve opening and closing action of the floor heating device. The floor heating device must fix the heat source, and then use Sister Qian's ability to insulate it. In this way, under normal circumstances, it will not release heat. However, if water contacts the aluminum sheet, its surface area actually changes, and it will naturally begin to release heat. When the water inlet valve is closed, the original surface area will be restored, and the heat source will automatically shut off."

The more Lu Yuning listened, the more surprised she became, and she was obviously impressed by her design.

Zhang Xinyue noticed Lu Yuning's expression and added, "However, I still need to try to determine if Sister Qian's abilities are the same as I thought. We previously only knew that deformation would cause the insulation to fail, which is why I came up with this idea. I wonder if a solid object wrapped in liquid would count as a change in surface area, and whether it can be insulated again after this surface area change."

This small device not only utilizes some physics knowledge, but also makes use of Zhang Qian's special abilities.

“It’s been thought through in great detail, very impressive.”

Zhang Xinyue smiled and said to Lu Yuning's praise, "With my current knowledge of physics, I can only make some small devices like this. Even with the advancement of technology, I won't be able to do anything."

Lu Yuning couldn't deny it, but they only had so many materials now, and they were unable to make something advanced.

This device has a prerequisite, which is to make a thermometer. Since we have glass and alcohol, it is relatively simple.

Just wrap a small amount of alcohol in a glass container under high heat.

When the alcohol cools and contracts, there is naturally a vacuum inside.

Before that, you need to confirm the tube diameter, maximum and minimum ranges, and internal alcohol content, which requires experimental measurement.

However, what they want to make is not a thermometer that can measure accurately in the true sense.

All we need is a device that is sensitive to temperature, so we can ignore things like scale dyes for now.

They didn't have much alcohol, and alcohol was very volatile, so Lu Yuning first tested it a few times with water.

In fact, if there was no alcohol, they originally planned to use water to make the thermometer, but water has a low coefficient of expansion and performs poorly in response to temperature changes, so alcohol is still the best choice.

Of course, the alcohol content of this liquor is not high, but they only have so much, and they dare not distill and purify it at will, so they can only use it as it is.

In the manufacturing room at this time.

Lu Yuning looked intently at the glass tube filled with alcohol in front of him.

Then it was placed on a heated aluminum sheet.

Before making a thermometer, you must first measure the maximum and minimum ranges.

In this way, the final inner diameter of the glass tube can be determined.

But there is a problem, that is, the large-scale thermometer is very long, at least more than 20 centimeters.

Apparently they don't have that much space indoors.

Ultimately, this device was to be placed indoors, so they roughly looked at the space in the shelter and ultimately determined that the thermometer could not exceed 5 cm, otherwise it would be difficult to place indoors and there would not be enough materials.

Therefore, under this premise, we need to deduce the tube diameter, maximum and minimum range, and alcohol content under known conditions.

Because temperature control is required, the measuring range should be within the acceptable range of body temperature, so 15~35 degrees Celsius is about right.

However, the specific temperature is obviously impossible to measure and can only be estimated by physical sensation.

For example, the outdoor temperature is already a little cold and the body feels a little uncomfortable, so this can be used as the initial range of the thermometer.

The maximum range is almost the same as human body temperature, so the maximum and minimum values can be determined.

Finally, the length and size of the outer glass tube and the amount of liquid inside can be confirmed.

(End of this chapter)