Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

Explain the difference between wetting agents and water-proof agents with respect to the phenomenon of surface tension.
Asked by MAANASI.M | 18 Nov, 2013, 07:11: AM
answered-by-expert Expert Answer
 
A substance that reduces the surface tension of a liquid, causing the liquid to spread across surface of a solid.
 
If such substances are added to the liquid, it lowers the surface tension and liquid can easily spread on the surface.
 
Contact angle is the angle a drop water makes with solid surface.
 
If contact angle is low liquid drop can easilly spread. Ex: water can easily wet the surface of a cottan cloth. Detergent also one example of wetting agent.
 
Water proof agents increases the surface tention hence the contact angle. Thus liquid can not spread on the surface. Ex: water beads on a wax or oily surface. water can not wet the oily surface because of high contact angle.
Answered by Komal Parmar | 19 Nov, 2013, 03:21: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Physics
pressure of a gas in a closed cylinder is expressed in the following manner p=pa+hpg identity the expression for absolute pressure and gauge pressure
Asked by rajuinwati12 | 04 Mar, 2024, 09:22: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
state and prove Bernoulli theorem
Asked by joelisaacsam | 09 Jan, 2024, 06:31: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
the terminal velocity v of a spherical ball of lead of radius r falling through a viscous liquid varies with r such that
Asked by rupimadhes | 21 Nov, 2023, 05:31: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
A copper cube of mass 0.5 kg is weighed in water. The mass comes out to be 0.4 kg. Is the cube hollow or solid? [Density of copper=8.96*10^3 kg/m^3]. Does a hollow cube displace more water than solid cube of same mass?
Asked by arjunsah797 | 12 Mar, 2022, 11:10: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
(ii) A Liquid of 10 litres with Relative density of 1.80 is mixed with 8 litres of a liquid of Relative density 0.80. If the bulk of the liqui shrinks one percent on mixing, calculate the relative density,  
question image
Asked by suragimathpraveen2001 | 10 Jan, 2022, 08:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Please solve the question. I can't understand how to solve this problem
question image
Asked by raghuvanshisaumya461 | 03 Dec, 2021, 08:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Whag is hydrostatic paradox? 
Asked by abhinavakrishna1009 | 31 Mar, 2021, 11:15: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Applications of Bernoulli's theorem can be seen in :  a. dynamic lift of airplane b. hydraulic press c. helicopter d. none of the above
Asked by vanshraaj.ind | 13 Dec, 2020, 06:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
14
question image
Asked by ashanihalchandani | 26 May, 2020, 09:11: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
When a capillary tube of diameter is 0.2mm dipped vertically in water the water raries 15cm find surface tension of water  
Asked by mahimanaik290 | 10 May, 2020, 12:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×