# What is angle of contact Class 11?

UPLOAD PHOTO AND GET THE ANSWER NOW! Solution : The angle between the tangent drawn on a force surface and the surface under the liquid in contact with it, is known as angle of contact. Answer.

## What is angle of contact in physics?

Definition of angle of contact physics. : the angle between the meniscus and the containing walls of a column of liquid measured from the vertical wall below the surface of the liquid to the position of the tangent to the meniscus at its point of contact with the wall.

## What is the formula of angle of contact?

Once you have a baseline and a gradient, you can calculate the angle between them. To do this, you can use the trigonometric functions. For example, if the gradient is 3, then you can use the relationship tan(θ) = (opposite/adjacent) = (3/1) to calculate the angle.

## What is angle of contact and capillarity?

The capillary effect of the liquid is decided by the contact angle. When the contact angle is less than 900 the liquid wets the surface. The liquid rises up the capillary tube. If the contact angle is greater than 900 the liquid does not wets the surface.

## What is the angle of contact explain with diagram?

Answer:When a liquid is in contact with solid, angle between solid surface and the tangent to the free surface of liquid at that point of contact, measured from inside the liquid is known as angle of contact.

## What is angle of contact write its properties?

Solution : The angle of contact for a liquid-solid pair (a liquid in contact with solid) is defined as the angle between the surface of the solid and the tangent drawn to the free surface of the solid and the tangent drawn to the free surface of the solid and the tangent drawn to the free surface at the point of …

## What is the symbol for angle of contact?

The angle of contact refers to the angle formed by a tangent to the liquid surface inside the liquid. It is denoted by the symbol θ. At the interfaces of different couples of liquids and solids, it is varied. The value of θ determines whether a liquid will spread or form droplets on the surface of a solid.

## What is capillarity Class 11?

Hint: Capillarity is a phenomenon by which the liquid moves without the help of gravity. The liquid level rises to some height against the gravitational force, through the narrow tube. This action is due to the phenomenon of surface tension of the liquid.

## What is Latent Heat Class 11?

Latent heat is defined as the heat or energy that is absorbed or released during a phase change of a substance. It could either be from a gas to a liquid or liquid to solid and vice versa. Latent heat is related to a heat property called enthalpy.

## What is angle of contact in surface tension?

The contact angle is a measure of the ability of a liquid to wet the surface of a solid. The shape that a drop takes on a surface depends on the surface tension of the fluid and the nature of the surface. At the boundary between droplets and the gaseous environment, the surface tension causes a curved contour.

## Where is the angle of contact zero?

If the angle is zero, it means the tangent is along the surface of the solid. Obviously the surface will be plane in such a case. This happens when water is kept in glass vessel.

## On which factor angle of contact depends?

The angle of contact depends upon the liquid’s nature and the solid in contact and the medium which exists above the free surface of the liquid. The angle of contact increases with an increase in the temperature of the liquid. The angle of contact decreases on adding soluble impurity to a liquid.

## How is capillary action measured?

Forces in Capillary Action The surface tension is measured in Newton/meter. Adhesive force: When forces of attraction between unlike molecules occur, it is called adhesive forces.

## What is ascent formula derive it?

Derive the ascent formula. Let a capillary tube of uniform bore be dipped vertically in a wet liquid. Since liquid is wet, therefore, the meniscus is concave. Let r be the radius of capillary tube, R be the radius of meniscus and θ the angle of contact.

## Is capillary action due to surface tension?

Adhesion of water to the walls of a vessel will cause an upward force on the liquid at the edges and result in a meniscus which turns upward. The surface tension acts to hold the surface intact. Capillary action occurs when the adhesion to the walls is stronger than the cohesive forces between the liquid molecules.

## What do you mean by angle of contact derive an expression?

The angle between tangent to the liquid surface inside the liquid is termed as angle of contact. It is denoted by θ. It is different at interfaces of different pairs of liquids and solids. The value of θ determines whether a liquid will spread on the surface of a solid or it will form droplets on it.

## What is angle of contact explain concave and convex meniscus?

When a liquid has concave meniscus, the angle of contact is acute. When it has a convex meniscus, the angle of contact is obtuse. For pure water and perfectly clean glass, the angle of contact is 0°. For ordinary water and glass, it lies between 8° and 18°. For pure water and pure silver, the angle of contact is 90°.

## What is angle of contact in case of liquid?

The angle made by the tangent drawn to the meniscus from the point of contact with the walls of the container measured from within the liquid is called the angle of contact. It depends on the atmospheric pressure, adhesive and cohesive forces of the liquid in the tube.

## Is angle of contact constant?

Solution : Characteristics of angle of contact :
(1) It depends upon the nature of the liquid and solid in contact, and is constant for a given liquid-solid pair, other factors remaining unchanged.
(2) It depends upon the medium (gas) above the free surface of the liquid.

## For which liquid angle of contact is zero?

Q. For a liquid with 0∘ angle of contact, the nature of meniscus is semi-spherical.

## What is 11th surface tension?

Hint:Surface tension is the tendency of the fluid surfaces to shrink into the minimum surface area possible. The surface tension can be determined by the difference of the interactions between the molecules of the fluid with the molecules of the flask or beaker or the molecules of the storage wall.

## What are the 7 types of angles?

• Zero Angle (0° in Measure)
• Acute Angle (0 to 90° in Measure)
• Right Angle (90° in Measure)
• Obtuse Angle (90 to 180° in Measure)
• Straight Angle (180° in Measure)
• Reflex Angle (180 to 360° in Measure)
• Complete Angle (360° in Measure)

## Does angle of contact depend on temperature?

We are also aware that the angle of contact is inversely proportional to temperature.

## What is angle and its types?

Acute Angle – An angle less than 90 degrees. Right Angle – An angle that is exactly 90 degrees. Obtuse Angle – An angle more than 90 degrees and less than 180 degrees. Straight Angle – An angle that is exactly 180 degrees. Reflex Angle – An angle greater than 180 degrees and less than 360 degrees.

## What is the SI unit of capillarity?

Circumference = 2P r. Surface Tension = g = Force/Circumference = P r2HDg / 2P r. g = rHDg / 2. g = (0.0100 x 5.00 x 0.800 x 980)/2 = 19.6 dyne/cm = 19.6 erg / cm2. In SI units, this is expressed as: g = 19.6 mN / m = 19.6 mJ / m2 .