What kind of experience is it?

In the first two days, the successful launch of the day launch warehouse was asked

There are aerospace dreams to Xiaobian!

Tracing the source, the object needs to be motivated

Can it be achieved in the water?

Let's try it

experiment equipment

Bid cups, glass, straws, liquid glue

experiment procedure

If we put a straw in the water,

We know that because the density of the straw material is slightly smaller than water,

The straw will float on the water

But we can inject some weight into the straw,

Such as liquid glue

Put the straw filled with glue into the cup,

(Avoid bubbles in the glue,

If there are bubbles, you can squeeze out of the water)

Sure enough, the straw will sink to the bottom of the cup

Because the density of the straw and liquid glue is not much different from water,

The straw is in a state similar to "micro -gravity" in the water,

Stir the water in the cup gently,

The straw will dance with it

At this point we can wait patiently,

See what the straw will do,

Or you can also stir the straws to play,

Accelerate this waiting process,

After a period of time,

We found that one end of the straw gradually lifted up,

And in the next few minutes, it tends to be vertical

This is a bit like the preparation before the rocket was launched,

Then we then wait patiently for the launch of the "Rocket":

Ohhhhh, it rises!

At this moment the Rockets will "tie" on the surface of the water vertically,

If we motion the water gently,

The Rockets will also slowly correct after swinging slightly:

However, with the exhaustion of "fuel",

The straw will also be separated from stability,

At this time, gently move the water,

The straw will float on the water

Original understanding

The liquid glue we use is a low -concentration polyacryol (PVA) colloidal solution. The relative density of PVA is 1.19, which is slightly heavier than water, so the straw will first sink to the bottom of the cup.

The hydroxyl group of PVA makes it dissolved in water, but the polymer chain makes it spread slowly in water, and the viscosity of glue and the wall of the straws further slows this process. If you carefully observe the liquid near the straw, you will find the wire -shaped stripes, which is the performance of high concentration PVA. Due to the restraint of glue, if the PVA diffusion at one end of the straw at the beginning is faster than the other end, the pressure of the pressure will cause the slower end to be affected. (It can be regarded as another liquid that flows slowly, and the overall discharge to one side of the straw)

At the end of the concentration of glue, the gravity of the straw and glue gradually gradually smaller than the buoyancy, forming a upward torque, and the straw is erected, just like a rocket stands up. When the total drainage in the entire straw is less than the overall drainage, the "rocket" will "launch".

Review

NO.312 pulls "Erhu" on the iron film, I saw the vice -voices | Play seriously

01. The experimental sharing of planting rabbits is as follows:

02. Yao's experiment sharing is as follows:

03.Daisy-experiment sharing as follows:

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Send out published by the Machinery Industry Press

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