Surface Tension

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What is the relationship between excess pressure and the radius of a bubble or drop?

No correlation

Constant

Inversely proportional (correct)

Directly proportional

What happens when two bubbles of different sizes are put in communication with each other?

Both bubbles maintain their original sizes

Air rushes from the larger bubble to the smaller bubble

Air rushes from the smaller bubble to the larger bubble (correct)

No air transfer occurs

What is the shape of the free surface of a liquid at rest?

Spherical

Random

Cylindrical

Perpendicular to the resultant force (correct)

What is the angle of contact between a liquid and a solid defined as?

The angle between the tangents to the liquid surface and the solid surface inside the liquid Signup and view all the answers

What is the shape of a liquid meniscus in a pure water and silver coated capillary tube?

Convex upward Signup and view all the answers

What is the primary reason why a small irregular piece of camphor floats on the surface of pure water and dances about?

It dissolves unequally and decreases the surface tension of the water locally Signup and view all the answers

Why do rain drops take on a spherical shape?

Due to the surface tension of the water Signup and view all the answers

What happens to the surface tension of a liquid as its temperature increases?

It decreases Signup and view all the answers

Why does oil spread on cold water but remain as a drop on hot water?

Because the surface tension of oil is less than that of cold water Signup and view all the answers

Why do the hairs of a shaving brush or painting brush stick together when taken out of water?

Due to the surface tension of the hair Signup and view all the answers

When n small drops of radius r coalesce to form a big drop of radius R, what happens to the surface area of the liquid?

It decreases Signup and view all the answers

What is the formula for the amount of surface energy released when n small drops of radius r coalesce to form a big drop of radius R?

4πT(nr² - R²) Signup and view all the answers

What happens to the temperature of a big drop if the released energy is absorbed by it?

It increases Signup and view all the answers

What is the excess pressure inside a bubble or drop due to?

Surface tension Signup and view all the answers

What is the formula for the velocity of a big drop if the released energy is converted into kinetic energy?

v = √(4πR²T/(r - R)) Signup and view all the answers

What happens to the surface energy of a liquid when its surface area decreases?

It decreases Signup and view all the answers

Why do soap films exhibit colorful patterns?

Due to the interference of light Signup and view all the answers

What is the primary reason for work being done against surface tension when a liquid is stretched?

To increase the surface area of the liquid Signup and view all the answers

When a large drop of liquid splits into smaller droplets, what happens to its surface area?

It increases Signup and view all the answers

What is the primary reason for the formation of bubbles in a liquid?

Due to the difference in pressure Signup and view all the answers

When a soap film is stretched, what happens to the surface energy of the film?

It decreases Signup and view all the answers

What is the primary reason why a bubble or drop tends to contract?

Due to the property of surface tension Signup and view all the answers

What is the work done against surface tension when a big drop of radius R is formed from n small drops of radius r?

4πT(nr^2 - R^2) Signup and view all the answers

What happens when a big drop of radius R is formed from n small drops of radius r?

The surface area of the liquid decreases Signup and view all the answers

What is the change in temperature of a big drop when the released energy is absorbed by it?

∆θ = JSd / 4πTR Signup and view all the answers

When a big drop of radius R breaks into n small drops of radius r, what happens to the surface energy of the liquid?

The surface energy increases by a factor of n Signup and view all the answers

What is the direction of the resultant force at the point of contact between a liquid and a solid, when the angle of contact is obtuse?

Directed inside the liquid Signup and view all the answers

What is the shape of the soap film formed when two identical circular frames are placed in parallel and separated by a small distance, with the frames being dipped in a soap solution?

Parabolic Signup and view all the answers

When a liquid drop is split into two smaller drops, what is the relationship between the work done against surface tension and the change in surface area?

The work done is proportional to the change in surface area Signup and view all the answers

What is the condition for a bubble to be stable in a liquid?

The excess pressure inside the bubble is greater than the surrounding pressure Signup and view all the answers

Surface Tension

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Questions and Answers

What is the relationship between excess pressure and the radius of a bubble or drop?

What happens when two bubbles of different sizes are put in communication with each other?

What is the shape of the free surface of a liquid at rest?

What is the angle of contact between a liquid and a solid defined as?

What is the shape of a liquid meniscus in a pure water and silver coated capillary tube?

What is the primary reason why a small irregular piece of camphor floats on the surface of pure water and dances about?

Why do rain drops take on a spherical shape?

What happens to the surface tension of a liquid as its temperature increases?

Why does oil spread on cold water but remain as a drop on hot water?

Why do the hairs of a shaving brush or painting brush stick together when taken out of water?

When n small drops of radius r coalesce to form a big drop of radius R, what happens to the surface area of the liquid?

What is the formula for the amount of surface energy released when n small drops of radius r coalesce to form a big drop of radius R?

What happens to the temperature of a big drop if the released energy is absorbed by it?

What is the excess pressure inside a bubble or drop due to?

What is the formula for the velocity of a big drop if the released energy is converted into kinetic energy?

What happens to the surface energy of a liquid when its surface area decreases?

Why do soap films exhibit colorful patterns?

What is the primary reason for work being done against surface tension when a liquid is stretched?

When a large drop of liquid splits into smaller droplets, what happens to its surface area?

What is the primary reason for the formation of bubbles in a liquid?

When a soap film is stretched, what happens to the surface energy of the film?

What is the primary reason why a bubble or drop tends to contract?

What is the work done against surface tension when a big drop of radius R is formed from n small drops of radius r?

What happens when a big drop of radius R is formed from n small drops of radius r?

What is the change in temperature of a big drop when the released energy is absorbed by it?

When a big drop of radius R breaks into n small drops of radius r, what happens to the surface energy of the liquid?

What is the direction of the resultant force at the point of contact between a liquid and a solid, when the angle of contact is obtuse?

What is the shape of the soap film formed when two identical circular frames are placed in parallel and separated by a small distance, with the frames being dipped in a soap solution?

When a liquid drop is split into two smaller drops, what is the relationship between the work done against surface tension and the change in surface area?

What is the condition for a bubble to be stable in a liquid?

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