Class 11 Physics | Surface Tension | #3 Some Facts About Surface Tension | For JEE & NEET

[@sjdnfjnj]

jee main 27 jan shift 1 they asked the same question about insoluble impurities!!!

[@alphaiitd1]

Thanks sir

[@SaurabhKumar-us3ty]

How can surface tension increase with adding impurities? Any example??

[@physicsgalaxyworld]

due to soluble impurities surface tension increases and because of colloidal impurities it decreases as surface tension is due to cohesive intermolecular forces between particles...

[@spearsupermanpunch]

salt water with nac; try to wash clothes with it and pure water u will now the answer bhai

[@UnparalleledSeema]

48 New subscribers in just 5 hours

[@ronitmandal7301]

Hi Sir, you said that surface tension decreases with increase in temperature, but sir according to my observation when we heat a bowl on oven and put some water in it drop by drop, instead of collapsing due to loss of surface tension, it becomes like balls (just like mercury, which has high surface tension) and roams around. Sir how can this be explained? Sir please reply. Thank you

[@saqibnawaz10]

That is caused by not only surface tension but also different phenomena. It's called the Leidenfrost effect

[@codeguy21]

@@saqibnawaz10 what 😱?? First time I am hearing this word.

[@ishaanlakhna8378]

@@codeguy21 not in JEE syllabus(dont worry)

[@dineshkumar-ht3zx]

how surface tension is scalar ? please give me reply

[@physicsgalaxyworld]

Its defined as the surface energy per unit surface area of a liquid surface so its a scalar... its also numerically equal to the force per unit length of any line considered on the liquid surface normal to the line... so it does not have a specific direction and does not follow the rules of vector algebra...

[@chandanbharti5207]

Same as presuure and force P=F/A p is scalar but f is vector

[@beharilal4072]

Sir how STension decrease with increase in temperature sir can you elaborate this plz

[@ishaanlakhna8378]

with increase in temperature, intermolecular forces start to break in liquid and so tension between particles reduces leading to decrease in surface tension

[@biswanathbauri8744]

Sir it is intramolecular phenomenon but u wrote intermolecular at 1:37

[@ishaanlakhna8378]

bhai yeh chem nhi hai yahan par jaise thermal physics mein irreversible aur reversible ek jaisi cheez hoti hai waise hi intra aur inter ek hi baat hai

[@sjdnfjnj]

no its inter only what are u on about

[@aspiringscientist1616]

Sir Plz Plz plz plz plz plz reply whether thrust is scalar or vector????

[@physicsgalaxyworld]

Thurst is a net force which is always defined in a specific direction so a vector quantity...

[@aspiringscientist1616]

@@physicsgalaxyworld thank u sir... I really appreciate ur promptness... Sir, I have another question... Is it u answering or any other PG team member??

[@hermionegranger8833]

@@aspiringscientist1616 Another PG team member...

[@aspiringscientist1616]

@@hermionegranger8833 R u "student forever"?

[@hermionegranger8833]

@@aspiringscientist1616 how'd you know?😂

[@Ashishsawadia]

I was shocked when I heared that physics also has some exception😢😭😭😭😢