Because there was no Wei Dalei with him this time, Chen Du made more preparations than before setting off.

At around 7:30, everyone got up one after another.

Washing is not available, and water is still a precious resource that can only be drunk, so everyone looks dirty.

In fact, it is not too difficult to get some non-potable water outside, and the temperature difference between morning and evening in the commercial market in April is quite large, and some crystal clear dew droplets can often be seen on the weeds on the roadside in the morning.

Although the amount is not large and cannot be compared with autumn, for human beings nowadays, a drop of dew can solve the water consumption of many people for a day.

It's just that it's always relatively dangerous to go to a place with grass, and Chen Du has also observed that there are some places where there are lush vegetation, and the weeds will stick out of the height of the road, so you can consider collecting dew later.

But that's not the most important thing at the moment.

After all, when the end of the world comes, it will only be a week, and many things are far more important than washing and showering, and things must be done one by one.

……

Du Jiajia is now accustomed to the position of a full-time chef, and after getting up and tidying up a little, she began to think about breakfast, and because Chen Du and the others were going out again, she had to prepare in advance.

"Do you want to bring some food with you on the way?" Chef Du has stepped into the role and taken the eating problems of all the members on himself.

"No, it won't take much time this time."

"Don't you need to bring a little bit for the new members? Maybe they've been hungry for a long time. ”

"When I left, they had a little food left, and it should be fine to hold on until now." He Ying explained.

Chen Du also said: "And with cooked food on you, it may attract flies and other things, but it will cause more trouble." ”

"Okay." Du Jiajia nodded, a little disappointed.

……

When everyone finished breakfast, the time was just eight o'clock.

Chen Du took his weapons and led He Ying and Sun Yuan to set off again.

Although I have walked the way out several times, I can't help but feel heavy every time, especially this time, knowing the tragic battle in the human world outside, I have more and more ominous premonitions.

Sometimes Chen Du really wants to hide and do nothing, so that he may be able to live longer, but his temperament has always made him prefer to draw a knife into a fast one rather than wait for death slowly.

……

"You say this thing, it's really a grenade?"

As He Ying walked, she held the two stones that Chen Du had given her before leaving, and although it was hard to believe that this thing that was simply an ordinary stone could be a grenade capable of exploding, she still looked cautious.

"Well, as long as there is no violent collision, it will be fine."

Regarding the grenade made by Dong Junwei, everyone has also studied, and the detonation mechanism of this thing is still not very clear, it does not have a fuse or anything like that, and it seems that it will only explode when it collides.

But how fierce the collision is the critical point, because there is no equipment and instruments, there is no quantification at all, only a general feeling, fortunately this thing is quite stable, and the general shaking and collision will not lead to false triggering.

The power of the grenade is directly proportional to Dong Junwei's current ability, the more serious it is when it is manufactured, the longer it takes, the more abundant the mental power, and the greater the power.

Tang Jing also thought about whether the power of the grenade would be weakened after being stored for a long time.

But in the past few days, there is no problem in this regard.

It's not the same as metal.

The metal object heated by Dong Junwei, although the speed of heat dissipation is much lower than normal, seems to have changed a lot in terms of specific heat capacity, but it will still cool down slowly after all.

Tang Jing once experimented that it took a full twenty-four hours for a piece of iron to be heated to smoke to completely cool to room temperature, and this cooling process was linear.

It is not clear whether Dong Junwei's ability has been improved after the heat preservation time has been strengthened, after all, the squad leader has not awakened long enough, and his ability is also very limited, so he cannot conduct more detailed experiments.

When he set off, Chen Du brought four grenades himself, two for He Ying, and one for Sun Yuan.

In addition, he also made a small shield for Sun Yuan, originally planned to get him a spear, but this junior brother in the first year of high school seemed to be very afraid of fighting and killing, holding a spear, no opponent was trembling there, and finally he could only give him a light iron shield to defend himself in a critical situation.

Sun Yuan held the shield in his hand, and felt very fresh all the way, and even talked a lot less.

He Ying only now understood what Tang Jing meant by "no need for melee combat" yesterday, if this thing really had the kind of power described by Chen Duan, it really didn't need to be in close combat with people.

It's a pity that everyone is wearing summer clothes.

In Chen's case, the short-sleeved T-shirt has no pockets, while the shorts have two pockets, both left and right, but they are too small to carry too many things.

Chen Du also considered transforming his clothes and making a few pockets, but the reality was that this was almost impossible to achieve, and every time he used his ability to use something like a towel, he would not succeed.

It's not that his ability can't work on the cloth, but every time it makes a mess, this kind of thing doesn't seem to obey his will at all, and every time it loses mental power, it is several times that of other objects.

It stands to reason that the density of the fabric is so small that this should not happen, but it is.

He and Tang Jing had also discussed this issue.

In the end, only a rough possibility can be guessed.

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 composed of thousands of cotton threads, and each cotton thread is composed of thousands of cotton threads, so, on the surface, Chen Duan is the ability to use a piece of cloth, but in fact, he is aiming for countless silk threads, the difficulty of which can be imagined.

Let's take an example that is easier to understand.

Chen Du can easily manipulate a copper block, but with the same quality of copper wire, the difficulty increases exponentially.

Therefore, for Chen Duan's ability, in addition to the density of the object, Tang Jing introduced a new key attribute.

Specific surface area.

The so-called specific surface area refers to the total surface area of an object per unit mass.

Another, more intuitive and easier to understand definition is: the ratio of the area to the 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 object, the larger 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 ball of iron, and a pile of iron powder, theoretically have the same volume, but the specific surface area of the two is very different.

Obviously.

This is the case with cloth.