Plasma (the 4th state of matter) in Hindi for Class 9

In this Science video for class 9 in Hindi we explained what plasma is, how plasma is formed and what the usage of plasma in our daily life are. This is a topic of chapter 1 - 'Matter in our Surroundings' of class 9th science from NCERT.

Before this we knew about the three states of matter, viz., the solid state, the liquid state and the gaseous state. But there are two more states, viz., plasma and the Bose-Einstein condensate.

🔴 What is plasma -
When a gas is sufficiently hot or a high electric field is applied to a gas, its electrons are ejected from the atoms and the gas is said to be ionized. This ionized gas, i.e., the mixture of the neutral atoms, the cations and the free electrons is called plasma.

🔴 Examples of plasma -
Plasma is found inside stars. This plasma is called the fully ionized plasma.

Lightening is another example of plasma. This plasma is called the partially ionized plasma.

Plasma is also used in fluorescent lights and plasma TVs. In fluorescent lights a gas in low pressure is inserted into a tube and voltage is applied in electrodes. Colourful light is emitted from the tube. The colour depends upon the gas inside.

🔴 Gas and colour
Hydrogen - red
Helium - yellow
Neon - orange
Carbon dioxide - white
Mercury - blue

🔴 Few terms associated with plasma

Plasma density - It is the number of free electrons per unit volume

Degree of ionization - it is the part of gas ionized.

Electron-ion collision frequency - It is the number of collision between free electrons with the cations.

Electron-neutral collision frequency - It is the number of collision between free electrons with the neutral atoms.

When the electron-ion collision frequency is larger than the electron-neutral collision frequency, it is called the fully ionized plasma. In other case, it is known as partially ionized plasma.

🔴 Click here to watch the whole playlist on 'Matter in our Surroundings' for Class 9 :

Previous videos -

🔴 Matter in our Surroundings ( Introduction )

🔴 States of Matter

🔴 Change in State of Matter

🔴 Evaporation

🔴 How does Evaporation cause cooling

🔴 Why should we wear cotton clothes in summer

🔴 Why do we see water droplets on the outer surface of a glass containing ice-cold water ?

🔴 Why does a Desert Cooler cool better on a hot dry day

🔴 Why do Naphthalene balls disappear with time without leaving any solid?

🔴 Why are we able to sip hot tea or milk faster from a saucer rather than a cup

🔴 Why does our palm feel cold when we put some acetone or petrol or perfume on it

🔴 Why is ice at 273 k more effective in cooling than water at the same temperature

🔴 Why a gas fills completely the vessel in which it is kept

🔴 Why a gas exerts pressure on the walls of the container

🔴 Kelvin Scale of Temperature

[abhinavjaiswal]

I was always in doudht of thi topic but u clear this

[UniverseLover]

Extremely interesting and useful video, Arijit sir. Love you sir ❤️❤️☺️ You are Genius and Unique. Take care of your health ☺️☺️🙏🙏👌❤️🇮🇳

[ksubscriber]

Really i am a teacher but i was not able to explain this topic much to our students but now everything is clear about this topic.thank you edu next.

[priyanshudubey]

Thanks 👍 sir mai hi bola tha es video ko bnane ke liye

[bikashmohanty]

Pranam sir you cleared so many doubt regarding plasma state of matter in this video.a lot of regards with my humble prostrations sir.

[sanjaychoudhary]

Pls a video on Bose einstein condensate

[xperimentousss...]

Wow sir, so nice
You have cleared all my doubts of this topic ☺️☺️
Thank you sir 👍🏻👍🏻

[colourthirst]

Oh!!!Sir really awesome video to clear dobuts.Waiting for more.👍👍

[apoorvabhardwaj]

Sid u are an amazing teacher. Can't tell how much ur videos help.

[ankitsaxena]

Sir I have a question is that we know that positive and negative charge particles are attract and positive and positive charge particles are repel but sir how the nucleon of an atom contain many protons (positive charge ) stay in the atom without repelltion. Please sir explain that.🧐🧐

[dushasanabehera]

Interactive classes always in edunext one class😇😇

[sushma]

The voice ... Matches the Both above level....


Thankyou so much for sincere efforts
Hats off to you dear educater🙏🙏

[jiyauddinqureshi]

Sir apka samjhane ka tareeka bhut achaa...mene itni bar ye toipc pda but first time ab aaya muje samj ...sir apki sbhi vedios osam he .. thnku so much sir...god bless you sir

[archanasoni]

It is very very helpful sir. Thankyou. Sir I have a question that is it necessary for plasma to be hot?

[supriyoghosh]

Sir you have amazing passion towards physics and also towards teaching, thanks a lot.

[ahmadali-plfc]

I really like your way of explanations.. Huge respect 💖💖

[shivansh]

Sir mai 10th me pahuch gya hu par phir bhi yeh dekh rha hun for knowledge sir kya badhiya explain kiya maza hi agyi 🤩

[Mrandmrsbilwan]

Looks .. I'm about get in to the science more deeply after this😲💓💓💓

[Sangeet-e-bhojpuriya]

Sir, I want to ask one question
At 9:51
You have said that No of negatively charged electrons and positively charged ions are not equal. But how can it be possible, we know that proton and electron have equal charges which is equal to 1.6 x 10-19 C.
And plasma is neutral. So, number of electron and proton should be equal.

[drivingmaster]

Finally ..uploaded your video...
Sir. You are great teacher