Properties of Fluids | Hydrostatics, barometer, gauge, paradox, pascal law, | Class 11| JEE | NEET
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- เผยแพร่เมื่อ 8 ต.ค. 2024
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mercury is used bcoz
1) It is more denser than water, so it can be filled more in less height
2) It does not evaporate
3) It is shiny so reading can be easily noted
Also, a very important point is that mercury has a higher surface tension than water, hence it does not stick to the apparatus, making taking a reading easier
Another correction:-
Mercury DOES evaporate, it's just that it's rate of evaporation is lower than that of water hence it's prefered
Saying "it does not evaporate" is absolutely wrong
Confused! We calculated the force which is equal to pressure x area so as presssure is p and area A so F=PA at point a, here we didn’t write F HOPE it is clear ☺️☺️plz let me know is it clear to you??
@Adi_rockxxamazing question, you're a very bright student
Your doubt is that, if vaccum is created, then there is no internal pressure in that portion of the barometer and hence the atmospheric pressure will crush the barometer.You are right, it would crush the barometer due to absence of internal pressure, so:
The shell of the barometer is strong enough to stand up to the force of atmospheric pressure. If it were made of some more flimsy material, it would be crushed. For example, a thin-walled plastic bottle will collapse if you suck the air out of it but a glass or metal bottle will not,as they can withstand atmospheric pressure.Also, there usually made of thick glass tubes to withstand the pressure.
@Adi_rockxx welcome bro:)
41:31 we used Mercury instead of water due to following reasons
(i) It is a dense fluid
(ii) It is opaque and shinning due to which taking readings become easy and accurate
(iii) It does not vaporise due to which pressure at the top most point remains 0
Mercury have relatively very low vapor pressure due to which we can measure wide range of pressures.
Exactly
mercury doesnot stick to surface of glass tube 🙄🙄
It is mentioned in alakh pandey sir's old video
41:32: we use Mercury because of following reason:
1. large density of hg
2. nonsticky
3.not vapourise
4.opaque nd shinning
41:26 1.water is less denser than mercury and perssure depends on density hence to that much atmospheric pressure we need ver very large tube
Sirrrrr magic you are now ahead of what my coaching was teaching from past 7 months
Today's lecture was very interesting
Learned many new things
Thanku sir❣
41:33
Sir we are using mercury insted of water because
A. Opaque, so easy to observe.
B. High density, so not need much height, water will need many more height.
Can you please tell that in 36:18 how sir took Pa as P⁰ + h×row ×g 🙏
Gupta sir is best 2021 teacher on youtube.ha mana k thoda fast padate hai per concept clear karane me kise kam nhi hai.yaha tak k alak sir bhi gupta sir ki kabiliyat mante
22.21 Sir kuki pressure is independent of are height same h or base area bhi so force is equal by using F=PxA
41:33
Sir, bcoz the atmospheric pressure is same and density of water is very low than Mercury, therefore the height of water raised in the tube is very high which cannot be measured
That's why, we doesn't use water
29:20
Sir, bcoz the walls in third beaker also exert force in upward direction
Mercury is used because
(i) It's more denser than water
(ii) It doesn't expand that much compared to water.
The same water will reach a height of 10 meters where as 0.76 m for mercury at sea level
41:08 sir because mercury has high density so we can measure atmospheric pressure easily.
41:30 We don't use water as its density is very low so it will rise more in tube and we will require a very long tube for experiment which is not convenient. Mercury has the highest density in liquid which is convenient for experiment.
We use Mercury because it has high density and at liquid state on room temperature hence small height of column .. As height and Density is inversely proportional hence it is convinient for our reading..
mercury is the most dense fluid. so a short column of mercury will apply pressure equal to atm. pressure
41:25 we are not using water instead of Mercury because
Density of water is very less as compared to that of Mercury so the length of tube required to measure the pressure would be very high
Yes this is the actual reason or comments toh bs chutiyape wale the shiney hota hai or reading le sakte hai easily etc. ......😂😂
29:42
sir 3rd container ki sides wali wall bhi 1st and 2nd container ke compare me badi h
Jo jaada force experience kar rhi hogi
So bottom point pe force( balance ) baki container ke same hi lagege
29:23 normalreactions from wall balance the force in each case
27:56 sir, teno pe bottom pe equal force lagega bcz hight same hai to pressure same hoga aur area of bottom same hai to force bhi equal hoga
28:10 All the bases have same force and it is due to Hydrostatics Paradox .
I also think the same
Mercury is used in barometers and not water. This is because the high density of mercury gives a reasonable height of the column to measure atmospheric pressure. While a barometer using water, for instance, would need to be 13.6 times higher column length than a mercury barometer to obtain the same pressure difference.
I have a dream that
If i could clear neet 2022😍
I will definitely prefer teaching in physicswallah as a career🤩🤩
Instead of MBBS
Good
Why you put "😍" emoji there?
@@skeptical_guy its just the immense love & support i have in my heart for pw
@@vaibhavramchandani7827 dude but just by looking at the emoji you can say its to used when you are obsessed over someone (not something) you could have used a heart .
But either way you sentence doesn't make sense to have a emoji like that . Cause you are talking about this channel being great and not something after you put the emoji
@@skeptical_guy okay than ,its just about the side we look in life
Your side right from your point of view & mine is right from my point.😌
Nothing to be cautious about just be happy😃😃
liquid container sabhi same height par hai.....
hence force sabhi par same hai
*_PADTE RAHIYE , ALL THE VERY BEST!!!_* -- ending words of alakh sir in every lecture
41:30 Sir because water density is low and in order to get the pressure same when tube is used, pressure will rise in tube in order to have the same pressure at the bottom of tube and we know that water will go from higher pressure to low pressure (vacuum in tube) and water will raise it's height very much about 1m which is not good from experimental point of view....Hence Hg is used.......
41:45.. sir kyuki water room temp.etc pe evaporate kr jaata h pressure accurately phir nii measure kr payege...am i right sir..plz tell 🤔🤔🤔🤔
41:35 because hg is densest , opaque , shining , don't vapourise so this all factors make us easy to identify the exact pressure
29:20 as area is greater in C so though it has more water force acting at base is same
Mercury is used in barometer because
1) it's non volatile and does not form vapour
2) have high density and therefore does not rise a maximum ht and hence we can take small tube
3) Do not stick to the flask
Happy to see you ☺ and study is going majedaar,khoobsoorat,and kkoi dikkatwali baat nhi h🙂🙃🙂🙃🙂🙃🙂😊😊😊😊
at 28:12 as P=F/A...as pressure being constant at base in every container ...so F∝A....so the container having broader base will experience more force...as i think🤔🤔🤔
EDITED: ohk!! as the base area of all the containers is same..hence the force acting on them will also be same 😁😁
27:46 force on each of the beakers' base is same.
@SHRISTI SHLOKA bruhh
40:41 Sir kyuki mercury sbse jyada density wala hota h isliye usse use krte h taki maximum valu nikal jaye pressure ki barometer se .. vese hm koi bhi liquid le skte h pr fir pressure vary kreg pr sbse maximum value mercury dega 👍👍hope sahi hoga
RG Sir is the most punctual teacher of this batch.
New chapter started.
RG sir jindabad
Please tell me full name of this teacher
@@kashaf3974Rohit gupta sir
41:39 - because the density of mercury in higher and it doesn't stuck on the walls of glass tube.
Sir pressure is same
in all 3 vessels. In small vessel normal reaction helps to maintain pressure.
Sir hydrolic paradox mei aap bta rhe ho ki height jyda this to pressure bda
But jb depth ka concept Aapne smjhya that tb Aapne btaya that ki pressure decreases with height
Mam hight Jada to pressure Jada nahi hota pressure is inversely proportional to height vo paradox ho ya depth height badh Jane par pressure Kam hota jata hai
Thx
Thanku alak sir for introducing a amazing sir like u 🙏🙏🙏🙏
Very good grammar used
sir, we are not using water in the barometer because to can evaporate, stick to the walls of the barometer tube which would affect the correct reading of the pressure in the barometer
Sir space mai space shuttle ke ander air hoti hai pr bahar vaccum hota hai to vaha khidki darwaje kyo nhi tot te
Woh normal glass nahi hai that's the reason
It is very much more durable
41:32 sir because mercury do not vaporise and it's opaque and also because it is densest so that height remains low that is 76 cm🙏🙏🙏
Oh I see
Sir k tshirt pe - samaj aaya to thoko taali 🤣😅 , I like it ❤️
29:38 sir force will be same because all beakers are having same area of their base and larger the area less is the force
Sir the air pressure can be more or less but it depends upon the surface area exposed to the atmospheric
At 41:30 mercury is used in barometers because it has high density
6:30
Sir according to me, air pressure is very high, see its order of 10^5, quite high value in SI units.
Same here 👍
Water is not used because when a tube is dipped in it.. it's raised height is 10.1m which is much much greater than raised height of tube in mercury (76cm)... If it is correct then like it RG sir..plss
“जहां आप की अहमियत समझी ना जाए वहां जाना बंद कर दो चाहे वह किसी का घर हो या किसी का दिल।”🙏
Hellooooo fake alakh sir 😂😂😂
Aap ke comment ki bhi koi kadar nahi h isliye pls comment section mein hagna band kijiye
@@rishirajverma8350 😁😂😂
29:22 a and c container ki walls Normal reaction laga rahi hogi.
A mein ye force badha rahi hongi and c mein ye force kam kar rahi hongi jisse force barabar lagega
Alakh sir se padha tha😅
Superrr explaination I ever seen ....
41:31 because at high temperature or low temperature state of water changes but mercury doesn't changes
May i know the name of this sir.
He was amazing in his teaching approach and made it very simple to understand these concepts.
Thank You PW
Rohit Gupta sir
sir if we use water then the height column will 10.33m which is approximately equal to a 3 storey building. Water absorbs a lot of other gases from the atmosphere which be mixed with the water easily
38:09 sir agar vaccum hota hai to wo tutta kyun nahi hai atmospheric pressure ke waja se?
Becoz that vacum is very low
28:11 teeno bases pe equal force lagega kyunki same height pe pressure same rhta hi or area same hai teeno ka or F=PA
Pehle lecture dekhlo
Seedha comments pe aa gate?🤣🤣
Ruk jao
Padhne jao....scroll down mat karo
Tumse hi baat kar raha hun
Jaoo
Acha ji!!😅😅 nahi kr rhi scroll down ab😅😅😅
Or koi pdhke comments pdh rha ho to??😂😂ur sentence gets failed out😂
Abey 😂
L lele c
@K.s wapas jaaker revision kr lo
Mercury when confined in a glass tube does not wet the wall due to its stronger cohesive force as compared to adhesive force
Sir properties of solid and liquid ka practice questions ka abhyas lecture....addi sir lele.....🔥🔥
Unke lectures bhut late aate he sir..👍🙏❤️
41:26. We are using Mercury becoz it has high density,low vaporisation, opaque.
Sir am i right?
MERCURY IS USED BECAUSE WITH THE CHANGE IN TEMPERATURES MERCURY EVENLY CONTRACTS OR EXPANDS..43:03
Sir normal atmospheric pressure 1.013×10⁵pa hotaa hai.
Thank you sir for making my concept tight on hydrostatics.🙏🙏
Bhai lecture complete hi nahi hua tha Aur thankyou aur concept tight .
100 min may pura dekh liya kya ???😉😉😉😉😉😉😉
@@navhis Nahi bhai actually phele se yeah chapter maine padh liya tha ncert mai se toh tight ho gaya concept
@@shashankjha4261 Abhi kon saa kar raha hai bhai ??
@@navhis Abhi thermodynamics kar raha hun bhai .
Is this one shot or lecture series?please tell me!
The lecture is just start in 3 sec ❤️ awysome sir
43:04 , mercury isliye use krte hai kuki mercury ki density bhot jyada hoti hh ye shinning hoti hh aur vaporize bi nahi hoti.
❤️☄️🎯
Lecture starts at 1:31
Save your time ..
your welcome 😊
Thanks
Present for this lecture sab chise jo apne batadiye samaj agaya sir 😎😎😎
29:11 sir i think saro m point of force same ho to sir pressure bhi same
Sir air pressure is large as ~10^5 N force is acting on 1m^2
B'coz mercury has the highest density
Sir because when we make imaginary cylinders in every container pressure will be same at bottom , and pressure also same at horizontal, pressure becomes same area also same then force will be same
41:33 paani ki density bhaut kam hae jisse uski height bahut bdh jayegi aur itni badi tube kha se layege
Second lecture kaha hai
Sir 27:55....C mein sabse zyada force lagega
now this whole pace series has become a vibe
At 26:00 (c) m sbse jyada pani h aur sbhi beakers m equal force/pressure lgega
Mind blowing lecture thank you sir
Sir please also teach us all the derivations for our school exams
How many watching thsi as backlog
Date:: 1 feb
5 feb
7feb
10 feb
12 Feb 😂
Me on 15 Feb 😎😎😎
Why not water 1) it is not easy to see and mark accurate highte measured
2) there are impurities in water there for error will be higher
3) water density changes due to geographic changes
4) small changes in temperature can cuase expansion or srink in the water.
6:28 sir air pressure jyada hota h
28:29 atm. Pressure on upper area
PHYSICS IS MOVING WITH A VELOCITY OF 1 CHAPTER / WEEK
WITH 100% ACCURATE LEARNING
41:30
We're using Mercury because
1. Water may form water vapour due to which there will be no longer any vacuum in the pressure due to which discrepancy in the data might take place.
2. Water is much less dense than mercury, and, to measure such a high pressure (~10⁵ Pa), a very long tube will be required as he water will rise much higher (~10 m) than mercury.
Sir properties of solid me sawaal bilkul nhi bn rhe h
Idea hi nhi aaraha h kaise Kare
Ek separate video bnado please sir
We use mercury because it shows great variation with temperature. When temperature decreases it contracts and when temperature increases it exapands.
6:39 bohot bada sirji
We don't use water because it is less denser, so it will attain more height
Sir this class is very interested..😁😁❤️
41:28 opaque.... High density......
It's nice to see that everyone is serious now🥺😙
They are commenting their answers instead of commenting something just to gain likes.
😁
Like u🙄😅
29 :39 because pressure of liquid is independent of the shape of the Container
41:46 Sir because Mercury is the densest liquid and it cannot be vaporised and vice-versa with water.
Sir at equal height pressure at all point are same
So equal pressure at all beaker
Sedule....❤️
Ab schedule ka kya kaam didi
5 baje maths and
9 baje organic chemistry
We use Mercury because Mercury has high density and water has low density (and if we use water we take height of tube is very heigh approx 10 m which is difficulty to calculate atmosphere pressure this reason we use Mercury
👍
Your way of explaining is just fantastic!
Sir Atm pressure is high because it drives oxygen in our blood by pressure gradient.
Anyone noticed in thumbnail
Bala doing underwater diving 😂😂
since density of water is very low as compared to the density of Mercury the rise in the height will more than few meter. and using a tube more than 1 meter long is practically not possible.