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# when the temperature is increased the angle of contact of a liquid

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## When the temperature increases, the angle of contact of liquid . Question

A

B

C

D

## None of these

Medium Open in App Solution Verified by Toppr

Correct option is A)

## As the temperature increases, the surface tension and cohesive force among liquid molecules weakens, so the angle of contact with solid surface decreases.

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स्रोत : www.toppr.com

## [Solved] With increase in temperature, the angle of contact in a liqu

The correct answer is option 3) i.e. Decreases CONCEPT: Surface tension is the tendency of water molecules to adhere to each other so as to form t Home Physics Fluids Surface tension

## With increase in temperature, the angle of contact in a liquid:

First increases and then decreases

Increases Decreases Remains constant

Option 3 : Decreases

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## Detailed Solution

The correct answer is option 3) i.e. Decreases

CONCEPT:

Surface tension is the tendency of water molecules to adhere to each other so as to form the minimum surface area possible.

This is a result of cohesion between water molecules.

​Consider a solid surface with a liquid placed over it as shown. Here θMath input error

Math input error

is the contact angle made by the liquid with the solid surface due to surface tension.

Molecules at the surface of a liquid are partly exposed to the surrounding. The molecules at the liquid-air interface experience fewer interactions and have more energy to escape to the surrounding.

The stronger the intermolecular interaction of the liquid, the greater is the cohesion.

​EXPLANATION:When the temperature of the liquid is increased, the molecular vibration increases, and thus the intermolecular forces weaken. This reduces the surface tension and cohesion.

When surface tension reduces, the tendency of the liquid to form minimum surface area reduces. This means the liquid tends to spread over the surface.

Thus, the contact angle decreases.

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Last updated on Sep 22, 2022

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## More Surface tension Questions

Q1. A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :Q2. The diameter of a capillary is 4 mm. If Reynolds's number of the tube is 1000 and the co-efficient of viscosity for the water is 0.02 poise, determine the maximum speed of water for the stream line flow in the tube?Q3. 'Two spherical soap bubbles of radii r1 and r2 coalesce to form a bubble of radius R. If the surface tension of soap solution is T, atmospheric pressure is P, the change in volume of the air enclosed is V and the change in surface area is 'A'. Complete the expression using above statement, 3PV + ___ = 0Q4. Two capillaries whose diameters are respectively 9.0 mm and 8.0 mm, stand one by one in water. If water rises to a height 4.5 mm in the first capillary, what will be the height of water in the second capillary? (choose an approximate value)Q5. What is the height of the fluid raise (h), when the capillary with the diameter (d) is dipped in the fluid having a density (

ρ

) and surface tension (

σ )?

Q6. Rain drops are spherical in shape because of -Q7. Unit of surface tension :Q8. The phenomenon of formation of vapour bubbles of a flowing liquid in a region where the pressure of liquid falls below the vapour pressure and sudden collapsing of these vapour bubbles in a region of higher pressure is called as ________.Q9. Why rain drops are spherical in shape?Q10. What happens when oil is added to water ? 1. Surface tension of water decreases 2. Surface tension of water increases 3. Oil will float

## More Fluids Questions

Q1. Water is flowing through a horizontal pipe of a non-uniform cross-section. At the extreme narrow portion of the pipe, the water will have:Q2. The terminal velocity of a falling sphere in a liquid is v. If the radius of the sphere is doubled then the sphere will fall with a terminal velocity-Q3. In a u-tube as shown in the fig. water and oil are in the left side and right side of the tube respectively. The heights from the bottom for water and oil columns are 15 cm and 20 cm respectively. The density of the oil is [take ρwater = 1000 kg/m3]

स्रोत : testbook.com

## When the temperature increased the angle of contact of a liquid

Cohesive force decreases so angle of contact decreases.

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When the temperature increased...

When the temperature increased the angle of contact of a liquid

Updated On: 27-06-2022

( 00 : 20 ) ADVERTISEMENT Text Solution Open Answer in App A increses B decreases C remains the same D

first increases and then decreases

Solution

Cohesive force decreases so angle of contact decreases. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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