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#InShot

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good day with you water for

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online together today we

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continue to read the paragraph on physics

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grade 7 author of the

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spoon parade of 11 mutual attraction and

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repulsion of molecules if all bodies

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consist of the smallest particles of molecules or

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atoms

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why don’t solids and liquids

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break up into separate molecules or

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atoms what makes them stick together

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because molecules are separated by

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gaps and are in continuous

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random motion, the fact is

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that

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there is mutual attraction between molecules, each

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molecule attracts all neighboring

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molecules and itself is attracted

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name when we break a thread, break a shelf

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or tear off a piece paper, then

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we overcome the forces along the stretch between

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molecules, it is absolutely impossible to notice the stretch between

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two molecules,

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as many millions of such particles are also attracted, the

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mutual attraction becomes

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significant, so it is difficult 1

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to tear a rope or steel

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wire with your hands, the stretch between molecules in

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different substances is not the same,

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this is explained by the different strengths,

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for example, steel wire, more precisely

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copper this means that the particles began to

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attract neighboring ones than

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copper particles, the distance between the molecule

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becomes noticeable only when

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they are very close to each other

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at a distance exceeding the size and the

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attraction of the molecules themselves weakens

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two drops of water merge into one if they

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touch 2 lead cylinders

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stick together if and

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press tightly against each other with smooth, freshly

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cut surfaces;

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in this case, the adhesion can be so

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strong that the cylinder cannot be torn away from

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each other even with a heavy load,

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Figure 26; however, the glass fragments cannot be

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fused even by pressing them tightly, due to

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irregularities, it is not possible to bring them together

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the distance at which the particles can

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attract each other, but if

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you soften the glass by heating, then the

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different parts can be brought together and the glass

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in this case is soldered, this means that the

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glass particles are at such a

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distance

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when attraction acts between them, the

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connection of pieces of metal during welding or

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soldering, as well as gluing is based

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throughout the molecules to each other,

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therefore,

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there is a mutual attraction between the molecules or atoms,

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which is noticeable only at a distance

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comparable to the size of the molecules or

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atoms themselves. We will try to find out why there

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are gaps between the molecules;

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if the molecules attract each other,

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then they should stick together,

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this does not happen because between

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molecules or atoms, at the same time,

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there is repulsion at a distance

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comparable to the size of the molecules or atoms themselves,

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attraction is more noticeable, and with

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further approach, repulsion many

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observed phenomena confirm the

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existence of repulsion between

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molecules,

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for example, a compressed body straightens,

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this happens due to the fact that when compressed, the

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molecules end up at such a distance

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from each other when repulsion begins to appear,

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some phenomena that occur in nature

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can be explained by the attraction of molecules

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to each other, for example, the wetting of a solid with a

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liquid exercise hang a

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glass plate on a thread so that its

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lower

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field is positioned horizontally

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Figure 27

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this plate is brought to the vessel by the summary

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a so that it lies on the surface of the

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water,

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figure 27, when you open the plate from the

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water,

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the spring will noticeably stretch,

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figure 27 b, this proves the

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existence of attraction between the maniac

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and by stretching the spring, you can judge

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how large it is;

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tearing off the plate, you can see that a

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thin layer of water remains on it, that is

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the plate is wetted with water, figure 27, you

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mean, when opening the plate, we

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overcame the attraction between the

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water molecules, the gap occurred to me where the

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water molecules come into contact with the

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glass particles, and where the water molecules

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come into contact with each other, water

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wets not only glass but also the skin of

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wood and other substances in many In some

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cases, water may not wet things,

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for example, if you dip a piece of

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wax or paraffin into water

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and then take it out, it seems dry. You are

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well aware that water does not wet

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fatty surfaces of the body. All of the

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examples given can be easily explained if a

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liquid wets a solid body, then this

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means that the molecules liquids

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are attracted to each other weaker than to

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molecules of the body when non-

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wetting is observed, this means that the

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molecules of the liquid are attracted stronger to

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each other than to the molecules of a solid body

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in the batum area

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and we nod with the phenomena of wetting and do not

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wet, so for example, thanks to the phenomenon

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of wetting, we can write wipe the

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wet items and so on, this

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ends paragraph 11.

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Goodbye, don’t forget to subscribe

00:06:56

to our channel and like

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7 класс. Физика. Учебник. Читаем онлайн. Параграф 11. Перышкин

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