# Physics – What is the Archimedes’ Principle?

Say you have a beaker filled with water and you put your index finger inside it. You’ll observe that the water level rises slightly. You put in two fingers, the water level rises a bit more. And now when you put in your hand up to the wrist level, you’ll see that the water level increases significantly. The ancient Greek mathematician Archimedes observed something similar when he got into a bath tub When he got in he realised that the level of water went up. In both the cases, you noticed that the water is DISPLACED by the object that goes in Keep this though in mind! We’ll come back to it soon. In our previous videos, we’ve seen that when an object is placed in or on the fluid, the fluid exerts a buoyant force on it which acts upwards. The Archimedes’ principle goes just one step further in saying that the buoyant force applied by the fluid is equal to the WEIGHT of the displaced Fluid We can take a simple example to understand this. Take a 5 kg solid object and suspend it by a spring balance The balance will read 5 kilograms. Let this be the first case. For the second case, take a beaker of water which has a small opening at the top The water in the beaker is filled right up to this point where the opening is And we keep a small container under the opening Now slowly lower the solid object into the water and you’ll see that the reading will be a lower number as compared to the previous case Why is that? It’s because of the buoyant force acting on the object You’d have also noticed that some water was DISPLACED. Now in this context, we can say that the weight of this displaced water is equal to the magnitude of the buoyant force acting on the object That’s the Archimedes’ principle! When an object is immersed fully or partially in a fluid, the upward force applied by the fluid on the object is the SAME as the weight of the fluid displaced by the object Where is this principle applied? Can you think of examples? How do you think large STEEL ships float? It’s simple If the weight of water displaced by the vessel BELOW the keel is equivalent to the vessel’s weight, then everything ABOVE the keel will remain afloat. That’s because the water too applies an upward buoyant force on the ship, which is SAME as the weight of the water displaced by it There’s just one last important concept left in this section And that’s relative density, which we will cover in the next lesson.

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## 100 thoughts on “Physics – What is the Archimedes’ Principle?”

1. Become Master 01 says:

I understood something from this video

2. jkirk1626 says:

Please present with someone who can speak English. Conquered savage coolie doesn't qualify.

3. Divya Sharma says:

Your videos are very nice and easy to understand

4. Rania Belmir says:

Please can someone tell me which logiciel they use to create such videos ?

5. John Smith says:

Video by idiot for idiots…with an idiotic voice.

6. Arwa Hakim says:

Nice examples thanks

7. Nivedita Garkoti says:

gud

8. Science 27k's Lovers says:

I really appreciate you!!!
Yours Channel is the great Academic in my experience!!!😊😊😊

9. Samyuktha Chandrasekar says:

10. 0L!V34 ABB3Y says:

I bet shes indian

11. Sudhir Tiwari says:

अगर कोई बॉडी पानी में डुबाया गया तो क्या उसका वेट डिस्प्लेज्ड लिक्विड के वेट के बराबर होता है और अगर उसी वेट के दूसरी चीज को पानी में डुबाया जाए जिसका वॉल्यूम अलग हो तो क्या वह पहले वाले से अलग पानी डिस्प्लेस करेगा अगर करेगा तो क्या दोनों के डिस्प्लेसिड प् लिक्विड के हाइट में अंतर होगा तो अगर वेट सेम है वेट है तो वाटर का वॉल्यूम अलग कैसे हो सकता है

12. just chill says:

Make videos in Hindi language please

13. Qwertyu Hi says:

I have one finger in your mom

14. panchapakesan Jawahar says:

Thanks al Lllllllooooooottttt

15. Abdi Rahman Ahmad Ali Farah says:

Then why the mass of reader decreased 😕😕 pleaSe i did'nt understand that point

16. rajmoney15 says:

I’m only here cause of science homework and I wasn’t paying attentions

17. Hitlar Singh Hitlar Singh says:

you are able to teach anything very well and in very less time i am wondered to thing that

18. Ranjith Kumar says:

Awesome explanation!!!😎😎

19. Suriya B says:

20. Joshua Stringam says:

0:15 peace

21. Nagaraja Rao Janardhana Prasad says:

Thank you so much and tomorrow is my physics exam on this topic😛

22. Rockey Mental says:

Not underdtanding its very hard

23. Navii says:

It is easy to understand. Bt, I have one doubt sir. Consider, I use iron ball fr weight. Iron ball will b small in volume & big in weight. Displaced water's volume = volume of iron ball, bt their weight will not b equal right??

24. Vinit Panwar says:

Ultimate understanding what a knowledge thanks😊

25. Sarvesh Bhatia says:

Can you explain the equation v*d*g

26. Asya Rizka says:

it says that everything above the keel would remain afloat if the amount of water displaced by the keel weighs as much as the "vessel" does vessel include the keel as well or just the top part?

27. Hoshiyar Singh says:

Angrajan

28. Rose Shameem says:

So well explained

29. V1ctor says:

superb video

31. Rahul Thakur says:

Genius

32. A B says:

the First 9/11 was Stopped by a US Citizen in 1999. Twitter: @awb555

33. Fasila Navas says:

Thank you

34. Brandon says:

What does she say at 2:23 "is equal sajdoijfoias to the vessels weight"

35. Ronan Mooney says:

I totally get it. I can't understand her but ummm I get it. Right?

36. Kashif Mudasir says:

I watched many vedios but didnt understand what actually was Archimedes principle but this vedio was so simple and made me understand. Thankyou!

37. Sidhanth.m Sidhu says:

Love ur presentation

38. Sourabh Sharma says:

Thank you sir

39. Deepak Rout says:

Deepak Kumar rout. Odisha, sir I need ur contact no.

SPEECHLESS… Are you the GOD of education??

41. ruben garcia says:

I am in 3rd grade and it all makes sense

42. Jeremy Smith says:

dog shit

43. SFK MD says:

You should have also told that the volume of displaced fluid is equal to the volume of immersed object.

44. Maya kevlani says:

Don't Memorize
Apply Practical knowledge

45. Mostak Ahmed says:

The law of archimedes is used in the field to float a body on a liquid. It is also used to make Submarine. Thanks… 😉

46. LOST ART says:

Can you please explain the topics “Conduction Convection and Radiation.please i really have to prepare the topic for my exams.

47. raj raj says:

please do more videos on measurement of density

My teacher wasn't able to teach this in class in whole one year

49. Varghese Jose says:

Supper

50. Varghese Jose says:

I can under stnd i study in 9 class❤👍👑💓💕💟💞💝💜💛💘❤💋💖

51. arunabha mukherjee says:

Faulty salla

52. Geetali Amin says:

Firstly I was thinking physics would be hard but now it seems very very easy……. I am loving this concept a lot

53. charu priyanka says:

I need laws of flotation please

0:08 the water may not be wet enough for four fingers. Stick to one or two.

55. Mr. Catz says:

Archimedes? NO!

56. Abay Tuyakov says:

Thanks it helped me a lot in my exams 😃😃

58. Shalu Dubey says:

Awesome mam thanks a lot

59. Captain M says:

Thank You for this lesson!! It was simple yet it could explain everything..

60. Fred Anjelo says:

keep it up…thanks

61. Nicholas Hernandez says:

Why you yelling at me

62. Orozconleche says:

I can’t understand why it won’t release the same volume but weight

63. Emanuel Mouratidis says:

Punjabis love Greek !

64. Taehoon LEE says:

The most simplest video to explain Archimedes' principle

65. Mark Bacon says:

Holy shit thank you so much

66. Somya Singh says:

Thanks
It helped me alot 😇😇

67. super kids says:

thanks for explaining and clearing my doubts………..

68. Naveen Naveen says:

It is newtons 3 ,low

69. Santosh Kumar says:

Mama aapka video to best hai but Naam jo aap English mein bol rahe ho usi ko aap Hindi mein bhi bolkar samjha do to the best rahega English walon Ko bhi samajh chuka Hindi walon Ko please aap Hindi mein dijiye main aapkohundred like and subscribe because mere classwiz sabhi bacchon ko uski video chahie

Thankyou so much😊😊

71. Faizan Imran says:

Archimedes principle states that
When a body is totally or partially immersed in a liquid than a upthrust acts on it which is equal to the weight of the liquid displaces

72. Tanya Singh says:

Very nice explanation

73. SHREYANSH RAJ says:

this video is posted on my birthday and it is really very helpful to me

74. Mousumi Khatun says:

Nice

75. Sophie Ahmed says:

She is good but not as good as free science lessons actually she pretty decent

76. Rajveer Singh says:

Maine jitni b vedios dekhi hai yeah vedii sbse khaaas hai aur very nice

77. Rajveer Singh says:

Maine jitni b vedios dekhi hai yeah vedii sbse khaaas hai aur very nice

Excellent teaching ma'am 👌

79. Hirakjyoti Kalita says:

ThnX for this awsome explanation♥️

80. Haram Shaikh says:

Thank you so much it was very easy to understand

81. guru twd says:

If the both matter of same density what will happen to the matter

82. Anil Kumar says:

Mam please make a video on Newton's law of motion

83. Kilimli Komrat says:

Aksaninibskm

84. JOKES on POINT says:

How does a submarine float inside the water. Want to know this

85. Dhiraj Kulkarni says:

Is floatation and archimedes principle the same???

86. Aainaa s says:

Very nice explaination ma'am ….it helped me a lot 😀😀

87. GOKUL p r says:

Thank you girl

88. Vijay Kumar says:

Thank

89. Leigh Duxbury says:

Global warming leaves the chat

90. sejal An says:

In simple definition and easy to understand

91. Dhruva Dhruva says:

I did not get it

92. Aakash Sawant says:

you guys are really doing a great job. I am an engineering faculty And I can surely say that you explained the concept to the point with a perfect example. All The best guys

93. nazeer ummarabba says:

Who all likes this channel

👇 Give a thumb 👍 👍

94. pavani chinnu says:

TQ so much for the clear explanation

95. Renu Singh says:

Your explanation method is just amazing..

96. abdulla ahmed says:

I didn’t understand the boat principle, can you help me with that ?

Thank you

97. Katkuri Hasmitha1 says:

Suuuuuper

98. Supernova says:

Now I remember why I couldn't learn shit in high school science. Imagine someone giving you a calculus equation to explain how fast they're driving. So stupid.

99. Abi Sheik says:

Den= mass/vol. Vol must be kept higher than the mass. Then the buoyancy force is higher and the object floats. Simply saying, density must be less than 1. .

100. Sneha's AMVs says:

EUREKA, EUREKA