What is S.I unit ? || Standard unit || Explained || Priyam Kumar

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system and is the most widely used system of measurement, with an official status in most countries.[Note 1] It comprises a coherent system of units of measurement including seven base units, which are the second (the unit of time with the symbol s), metre (length, m), kilogram (mass, kg), ampere (electric current, A), kelvin (thermodynamic temperature, K), mole (amount of substance, mol), and candela (luminous intensity, cd).[1] The system allows for an unlimited number of additional units, called derived units, which can always be represented as products of powers of the base units.[Note 2] Twenty-two derived units have been provided with special names and symbols.[Note 3] The seven base units and the 22 derived units with special names and symbols may be used in combination to express other derived units,[Note 4] which are adopted to facilitate measurement of diverse quantities. Another characteristic feature of the SI system is that it provides twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units, always in powers of ten. For example, k, 'kilo', stands for a factor of 1000, so one kilometre (1 km) is 1000 m. As a consequence, the conversion of units within the SI is always through a power of ten.[Note 5] The SI is intended to be an evolving system; units and prefixes are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves.
Since 2019, the SI system of units has been defined as the system of units in which seven particular defining constants have certain exact numerical values when expressed in terms of their SI units. For example, one of these defining constants is the speed of light in vacuum c, which in the SI by definition has the exact value of c = 299792458 m/s. The other six are the hyperfine transition frequency of caesium {\displaystyle \Delta
u _{\text{Cs}}}{\displaystyle \Delta
u _{\text{Cs}}}, the Planck constant h, the elementary charge e, the Boltzmann constant k, the Avogadro constant NA, and the luminous efficacy Kcd. Mathematically, every SI unit is a unique[Note 6] product of powers of the defining constants divided by their exact numerical SI values.[Note 7] The nature of the defining constants ranges from fundamental constants of nature such as c to the purely technical constant Kcd.[1]:128-9. Prior to 2019, h, e, k, and NA were not defined a priori but were rather very precisely measured quantities. In 2019, their values were fixed by definition to their best estimates at the time, ensuring continuity with previous definitions of the base units. One consequence of the redefinition of the SI is that the distinction between the base units and derived units is in principle not needed, since any unit can be constructed directly from the seven defining constants. Nevertheless, the distinction is retained because 'it is useful and historically well established', and also because the ISO/IEC 80000 standard specifies base and derived quantities that necessarily have the corresponding SI units.[1]:129
The current way of defining the SI system is a result of a decades-long move towards increasingly abstract and idealized formulation in which the realizations of the units are separated conceptually from the definitions. As far as realization of units, the CIPM Consultative Committees, based on the best available science of the moment, recommend a variety of experimental methods that can be used to realize the definitions of the base units. Descriptions of what are believed to be currently best experimental realizations are provided as so-called "mises en pratique" (practical techniques).[2] The great advantage of doing it this way is that as science and technologies develop, new and superior realizations may be introduced without the need to redefine the unit.[Note 8] A disadvantage of this system is that it lacks the simplicity and conceptual clarity of e.g. using artefacts to define the units, in which case the definition and the realization are equivalent. One problem with artefacts is that they can be lost, damaged, or changed; another is that they largely cannot benefit from advancements in science and technology. The last artefact used by the SI was the International Prototype of the Kilogram, a cylinder of platinum-iridium. Concerns regarding its stability on the one hand, and progress in precise measurements of the Planck constant and the Avogadro constant on the other, led to a revision of the definition of the base units, which was put into effect on 20 May 2019[5] and resulted in the definition of the SI system as described above. The past definitions of the SI relied on various other approaches, e.g. a specific physical state such as the triple point of water for the

[@familyphone3102]

I am not your class or school student than also ☺️ I like your explanation so much sir. That's why Dil se thank you very much.

[@chiragkatre9283]

Nice comment

[@--dyk]

Wtf is wrong with your english 💀💀

[@mallsabb7191]

Sir aap video banai bhut acche se smj aya

[@Lovers_step_38]

Ths bro bahut aache se samjhaye aapne , i am very thankful to you 👍 keep it up

[@sarfaraazdar4088]

Outstanding lecture.... thanks

[@4u_bts288]

Brilliant sirr... ❤️ Thnx!!...

[@BacklogList]

Education is the most powerful weapon, which you can use to change the whole world"😳😳😳 Have A Positive Day !!!

[@BacklogList]

@@ShaikhShifa-fg7fp yeah 🚮

[@Hazal6698]

Fantastic sir...............

[@bhumiharji5828]

Out standing sir please explain for class 5

[@jangidgirls8223]

Thanks sir for clear my douts ❤

[@shreya_rai.123]

Can you explain me how to slove 10km/hr to m/sec

[@hritiksharma7217]

First you have to know 1 km is equal to 1000m so 10 ×1000 and get 1000m so now you will write this as 10000m/s

[@aryanmishra1122]

@@hritiksharma7217 Abe second change nhi krega kya

[@animeongakusensei8692]

I can solve First do 10 into 5 then divide by 18 U will get answer 2.77 approx

[@familyphone3102]

Thank you sir very much ☺️😊

[@pravin5987]

1 kg =1000g. 20kg =20x1000=20,000g

[@simpsensei]

I made of your 101 like😁

[@Bhagti.chennal2024]

Aapne 1kg mein 100gm bataya Hai per 1kg mein 1000gm hote Hain na🥺 I am in confusion

[@Travel_with_train_2024]

1000 hoga

[@ambika3724]

Sir ne galti kar di hai 😅

[@Pradeeprajput_6002]

Sir ne galti ki hai😅

[@Pradeeprajput_6002]

1000gm ans Hai

[@pravin5987]

Brilliant class, or Brilliant teach

[@SadhanaSadhanaYadav-p9f]

Thank you so much sir bahut acche se samajh aa gaya😊😊😊

[@vijaylall3402]

You have mentioned 1Kg = 100g?

[@parshan7863]

bro 1kg=1000g

[@AmjadAli-zz1lm]

thank you Sir,🤗

[@alameditz2240]

1 kg =1000 not 100 🧐

[@mr_star7]

Best work

[@kaishahmed8151]

👍👍👍👍

[@bublaShorts]

very knowledge full

[@kartik533.]

Thanks👏👏

[@babitarani9691]

Sir please tell question convert 30m/s =km/hr

[@incrediblemakeover5393]

🎉🎉🎉

[@totalgamer6577]

Thanks sir for the explanation

[@ahemsingh2086]

your are right

[@chiragkatre9283]

FF

[@anubhabghosh9277]

Sir made 100 likes

[@junaidgouri6864]

Thank you sir❤️

[@amitkulkarni8771]

Thanks you sir lots

[@SadiqKhan-uy8ki]

Ni Howa sir😜

[@zubaidashaikh9407]

Nice lecture thank you sir

[@Opop20105]

❤❤❤

[@madhushrestha2791]

Thank u brother

[@codingwithsaadahsankhan]

Nice but sir 1kg =1000gm not 100 ok sir don't mind

[@dnyaneshwarijagdale9520]

Thank you so much

[@moon3am509]

Thank you sir

[@amyamyverma7983]

🙏🙏🙏

[@rishukumar142]

Hii

[@amyamyverma7983]

Hy

[@rishukumar142]

how are you

[@amyamyverma7983]

Too good

[@rishukumar142]

okk

[@mohankumarroy6025]

Thanks sir l like this explanation

[@zafferiqbal1974]

Thxu sir

[@vsfilmsgaming1950]

Aapne bahut acche se padhaya

[@ArminkBoy74]

0.03 km/0.36sec Am i right or not ?

[@gomakarki4275]

Thanks a lot

[@jschannel5545]

Ikg=1000g sir please check it.

[@fahadsumalani4606]

Thankyou

[@harshrajpandey7610]

1kg =1000g Not 1kg =100g

[@parthapratimdebnath6607]

Sike that's the wrong number

[@SadhanaSadhanaYadav-p9f]

Kon kon 2024 me dekh raha hai 😊😊

[@JatinSingh-wl8ex]

Thanks bro

[@shirazmelvi7068]

thanks sir

[@lalramsangi2241]

You are the best well i am class 6 and i didn't understand it but you make me understand it thank you so much you should be a teacher😁

[@hanakhan7029]

nice sir

[@LalaLajpat-p9s]

Sir 1kg=1000g

[@businesIdeassarojsky]

Thanku sir

[@moon3am509]

Thank you sir bt please video upload krte samey typing mistake check kre .... superb concept

[@rishukumar142]

hii

[@generalknowledgemcqs1289]

Sir g 1kg main 100gm hai 😄😄😄

[@g.swarriors5905]

Love it

[@mr.active8317]

Sir 1kg=1000g hota hai na appne tho 1kg=100 gram likha hai Sir mai aapke burie nahi kar raha lekin waha par appko edit karke thik karna chaiye tha 😅😅

[@Opop20105]

Thhhhhhhanks

[@ajayYadav-mc8is]

Bijay yadav Don

[@anshooprajapati8826]

Very good lecture that whi i am giving you a like

[@mrbholamrbhola6047]

Thanks a lot sir

[@adityabarik9813]

Thanks you

[@divyanshinityakidscorner]

You are wrong there is 1000 g in 1 kg

[@divyanshinityakidscorner]

❤

[@pubgchora8375]

You are best

[@subhashkathar415]

Siunit kub dikhianga

[@manikantak.v7199]

Thx a lot

[@manikantak.v7199]

It was a basic thing which was so important in next class

[@babitamandal8268]

Very nice sir op op 😇😇😇

[@omprakashprajapati8442]

Sir aap Accha padha lete hai me aapki student nhi hu but kya aap mujhe science padha skte hai 9 class ke

[@doseoffaiyaz]

If you're going make a non-english video why even think about making a video title in English? What is this absurdity?

[@sajinv6176]

1kg=1000 g Not 100g

[@ankitjoshi9719]

Write any two different between SI unit and Standard unit

[@hamzanaek8150]

I can’t understand the last one

[@RajeevKumar-qc8go]

😊

[@durgeshkumarpandey4073]

This video is like an asmr

[@ranjanadevi6724]

Thank you so much 💕

[@shwethasai5464]

1kg =1000gm not 100gm.🙄

[@atulvishwakarma107]

Sir 30m equal to 0.03 kg But How to convert pr sec in hr Help m please Your last questions this is

[@gkquestions2215]

Very good

[@MotivationalSZStudy]

K

[@kann56cs84]

Sir me 6me hu bar hamko ye pada diya

[@Loop_Fall_YT]

Very nice sir ❤️❤️❤️❤️😘

[@Its_cute_girl9582]

Suna hai

[@banamalidas4690]

Nice sir

[@Mrvolcanion]

Haluwa padhaya apne😂🦍

[@fahimmahir7779]

1 Kg=1000 not 100😂

[@jagannathcscreation9570]

No sir please

[@Gamingffxyz]

1 KG ME 100 GRAM LIKH DIYA

[@naveedgill6472]

How it is possible 1hr = 3600sec no 60 sec

[@lalramsangi2241]

You didn't understand it just try to understand it ok Like me 😎😎😎😎 Ok really which class are you maybe you didn't understand so just try to understand You know what people used to say Mistake makes man perfect Keep trying don't give up

[@bishnupriyapradhan4128]

Kitne bar thik hai bol rehe hai

[@aapni.duniya]

1km me 1000 gm hote he 100 nahi

[@Anime-ci1wz]

sir can u make it

[@vishalandsuhanipatel8622]

Last Wala nahi as Raha hai

[@aminjakhar8611]

T. Y.

[@satyamkumar-z6n5r]

i am 956 sus

[@rehan.r.shaikh7060]

Sir mass ka si unit kya hai

[@mohammadmonish4450]

1 kg

[@komaltomar5984]

Kg

[@yuvrajsinghc3741]

Nag

[@princesaha470]

Mara bi naye hoya sir

[@manjupatil4717]

Sir I

[@dada_bhai184]

10km= 10km x 1000m= 10,000m 1hr = 60min=60=sec. 60minx 60sec=3600 sec in one HR _ 3600sex x 10hr= 36000sec 10,000m/36000sec answer

[@wani4668]

good sir.

[@superytgaming2424]

noob kuch pata hee nahi

[@superytgaming2424]

time si unit is second

[@durgeshkumarpandey4073]

Toh pagal usne time ke si unit ko sec hi bataya hai

[@durgeshkumarpandey4073]

Noobde hater thuje toh kuch pata hi nahi hai