Chapter 52 Specific Surface Area
Because Wei Dalei was not accompanying him this time, Chen Mu made more preparations than before before setting off.
Around 7:30, everyone got up one after another.
There is no washing, and the current water is still a precious resource and can only be used for drinking, so everyone looks dirty.
In fact, it is not too difficult to go outside to get some non-potable water. In April, the temperature difference between morning and evening in the shopping mall is quite large. In the morning, you can often see some crystal clear dew drops on the weeds on the roadside.
Although the amount is not large and cannot be compared with autumn, for modern humans, a drop of dew can solve the water needs of many people for a day.
However, it is always relatively dangerous to go to places with grass. Chen Mu has also observed that in some places with lush vegetation, the weeds will extend beyond the height of the road. You can consider collecting dew in the future.
But this is not the most important thing yet.
After all, when the end of the world comes, it only takes a week to make a full plan. Many things are far more important than washing and showering. Things must be done one by one.
...
Du Jiajia is now accustomed to the position of a full-time chef. As soon as she gets up and tidies up a little, she starts to think about breakfast, and because Chen Mu and others are going out again, she has to prepare it in advance.
"Would you like to bring some food with you on the way?" Chef Du has stepped into the role and takes all the meal problems of all the members on himself.
"No, it won't take too long this time."
"Don't you need to bring some to the new members? Maybe they have been hungry for a long time." "
When I left, they still had some food left, so hold on until There should be no problem now." He Ying explained.
Chen Mu also said: "And carrying cooked food with you may attract flies and other things, which will cause more trouble." "
Okay." Du Jiajia nodded, feeling a little disappointed.
...
By the time everyone finished breakfast, it was just eight o'clock.
Chen Mu took his weapons, led He Ying and Sun Yuan, and set off again.
Although I have walked the road out several times, I feel heavy every time. Especially this time, knowing the fierce battles in the human world outside, I have an even more ominous premonition.
Sometimes Chen Mu really wants to hide and do nothing, so that he might live longer, but his temperament has always made him rather use the knife to achieve quick results than wait for death slowly.
...
"You said this thing is really a grenade?"
He Ying walked, holding the two stones that Chen Mu gave her before setting off, although it was hard to believe that this thing that was just an ordinary stone could be The grenade exploded, but she still looked cautious.
"Well, as long as there is no violent collision, everything will be fine."
Regarding the grenade made by Dong Junwei, everyone has also studied it. The detonation mechanism of this thing is still not very clear. It does not have a fuse or anything like that. It seems that it only has a collision. , will explode.
But how violent the collision is is the critical point, because without equipment and instruments, it is impossible to quantify it. There is only a general feeling. Fortunately, this thing is relatively stable, and ordinary shaking and collision will not cause false triggering.
The power of the grenade is directly proportional to Dong Junwei's current ability. The more serious it is when making it, the longer it takes, and the more energetic it is, the greater its power will be.
Tang Jing also thought about whether the power of grenades would weaken after being stored for a long time.
But judging from the past few days, there is no problem in this regard.
This is different from metal.
Although the metal object that Dong Junwei heated dissipated heat at a much slower rate than normal and seemed to have a great change in specific heat capacity, it would eventually cool down.
Tang Jing once conducted an experiment. It took a full twenty-four hours for an iron block that was heated to emit green smoke to completely cool to room temperature, and this cooling process was linear.
It is unclear whether Dong Junwei's insulation time has been improved after her enhanced abilities. After all, the squad leader's awakening time is not long enough and her abilities are very limited, making it impossible to conduct more detailed experiments.
When setting off, Chen Mu brought four grenades, gave two to He Ying, and one to Sun Yuan.
In addition, I also made a small shield for Sun Yuan. I originally planned to get him a spear, but it turned out that this junior high school student seemed to be very afraid of fighting and killing. With a spear, no opponent would be able to fight. Trembling there, in the end he could only be given a thin iron shield to defend himself in times of crisis.
Sun Yuan held the shield in his hand. He felt very fresh along the way and even talked a lot less.
Only now did He Ying understand what Tang Jing meant by "no need for close combat" yesterday. If this thing really has the power described by Chen Mu, it really doesn't require close combat.
It's a pity that everyone is wearing summer clothes.
Taking Chen Mu as an example, the short-sleeved T-shirt has no pockets, and although the shorts have two pockets on the left and right, they are very small and cannot carry too many things.
Chen Mu also considered modifying his clothes to make a few pockets, but the actual situation is that this is almost impossible to achieve. Every time he uses his ability on things such as towels, he cannot succeed.
It's not that his ability can't work on cloth, but it makes a mess every time. This kind of thing doesn't seem to obey his will at all, and the mental power consumed every time is several times that of other objects.
Logically speaking, the density of the fabric is very small, so this situation should not occur, but it is actually the case.
He and Tang Jing also discussed this issue.
In the end, we can only guess a rough possibility.
Because unlike dense materials such as metal and plastic, cloth is not strictly a whole.
Take a piece of cotton cloth as an example. It is made up of thousands of cotton threads, and each cotton thread is made up of thousands of cotton filaments. Therefore, on the surface, Chen Mu can use the ability on a piece of cloth. But in fact, his target is countless threads, and one can imagine the difficulty.
Let’s give an example that is easier to understand.
Chen Mu can easily control a piece of copper, but with the same quality of copper wire, the difficulty increases exponentially.
Therefore, for Chen Mu's ability, Tang Jing introduced a new key attribute in addition to the density of the object.
Specific surface area.
The so-called specific surface area refers to the total surface area of an object per unit mass.
Another definition that is more intuitive and easier to understand is: the ratio of the area and volume of an object.
Obviously, a spherical object has the smallest specific surface area, and roughly speaking, the more irregular the shape of a single overall object, the greater the specific surface area is likely to be.
But the best way to increase the specific surface area is to cut the object.
The same mass of iron, a whole iron ball, and a pile of iron powder, theoretically have the same volume, but their specific surface areas are completely different.
obviously.
This is the case with fabric.
(End of chapter)