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작성자빠가사리 조회 6회 작성일 2022-01-11 12:04:21 댓글 0


Qu'est ce que le plasma ? - Claire DOUAT

Le plasma représente 99% de la matière de l’univers (sans prendre en compte l’énergie sombre et la matière noire), et pourtant il est très peu présent sur Terre.

En visionnant cette vidéo, vous apprendrez ce qu’est un plasma et quelles sont les applications en lien avec.
TheSumiste : Excellente vidéo! en tant que technicien sur système plasma, je peux dire qu'il est rare de trouver une explication assez claire mais pas si difficile à comprendre (un peu technique c'est vrai) merci pour cette vidéo.
Des Champagnes pour la Vie : Merci beaucoup pour cette vidéo ! Quand vous dites, "le plasma est un gaz qui émet de la lumière", voulez vous dire, de la lumière visible ? Ou bien, cette définition s'applique aussi pour le spectre non visible de la lumière ? Ou à tout ou partir du spectre électro-magnétique ?
STEPHANE SEGRETO : Excellente présentation et merci pour partager votre connaissance. Le monde qui nous entoure est une merveille. Bonne continuation dans vos recherches.
marie vl : Merci Claire. Vraiment passionnant, donner de votre temps pour nous faire comprendre facilement des choses difficiles. C'est là qu'Internet est passionnant surtout quand on est âgée, loin de tout. Un grand merci. Bonne continuation dans vos recherches
Mathieu Thomachot : Salut Claire. Excellent, je ne savais pas que tu avais fait cette vidéo. Bravo !

What Is Plasma | Properties of Matter | Chemistry | FuseSchool

What Is Plasma | Properties of Matter | Chemistry | FuseSchool

Learn the basics about plasma - the fourth state of matter, when learning about properties of matter.

When ice is sufficiently heated, it melts to form water. It has therefore undergone a change of state – from a solid to a liquid. Recall that in a solid, all of the particles are closely packed in a fixed position, and therefore has a fixed shape and volume. The particles in a liquid are still touching one another and are able to move around one another, therefore, a liquid still has a fixed volume but takes the shape of their container.

Water evaporates from a liquid to a gas. The particles in a gas are further away from one another and take the shape and volume of their container. For certain substances, if we continue to apply heat to their gaseous form, another change of state could occur. These substances can go from a gas to a state of matter called plasma. For this change of state to occur, very strong heat must be applied. When heat is sufficiently strong, the electrons are stripped from their respective atoms, creating free electrons and positive ions. Although there are both negative and positive particles, overall, plasma is neutral as there are equal amounts of oppositely charged particles. Because there are free electrons, substances in a plasma form can conduct electricity.

This is what separates a gas from plasma – gases cannot conduct electricity, but plasma can.

Naturally occurring plasma include lightning and the Northern lights. Stars also exist in plasma form – in fact stars are just really hot balls of plasma. Plasma can be found in fluorescent light bulbs and neon signs.

When an electrical current is passed through the mercury vapour in fluorescent light bulbs and certain noble gases in neon signs, it heats up the gases sufficiently to strip the electrons and create plasma. The technology actually goes even further beyond light bulbs and neon signs. Plasma screen TVs are made possible due to this state of matter. A plasma screen is made of many thousands of tiny dots called pixels, which are made of three fluorescent light electrodes, emitting the colours red, green, and blue. The combination of these colours can give any possible colour, which is why we can see all colours on these screens.

The higher the number of pixels, the higher the definition, and the images will appear “sharper” and more detailed.


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Sarim Malik : Stupendous . Great work , most of the teachers ditch the question regarding plasma state but it's really gratifying when your curiosity is valued .
benara : i was just interested in plasma bc it doesn't go with my syllabus but this is really interesting,the video is very detailed and easy to understand, thank you.
Mirza Salkić : Explainig simply is really an art ....
Rubisha_a : Excellent explanation I ever seen such a good teacher like u
God bless you
Stay strong and stay safe
And of course stay gold
Henrique Alves : Thank you so much for the explanation, simple and and helpful.

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