Table of Contents
- 1 Why is the surface of a liquid?
- 2 What is the relation between surface area of liquid and evaporation?
- 3 Why liquid tend has lowest surface area?
- 4 What is it called when evaporation occurs beneath the surface of a liquid?
- 5 How is the surface tension of a liquid measured?
- 6 Why does liquid water have a concave surface?
Why is the surface of a liquid?
Surface Tension: “The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.” It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface.
Do liquids minimize surface area?
The system consisting of a liquid will tend to minimize the surface area because such configuration will have minimal energy. This phenomenon is referred to as surface tension. In brief, surface tension is the energy required to increase the surface area of a liquid by a unit of area.
What is the relation between surface area of liquid and evaporation?
Effect of the Surface area: Evaporation increases with the increase in surface area. It is because, the larger the surface area that is exposed to air, the more molecules will escape into the air. When the water is heated, the water molecules tend to move rapidly. This makes the molecules escape faster.
What only occurs at the surface of a liquid?
Evaporation takes place only at the surface of a liquid, whereas boiling may occur throughout the liquid. In boiling, the change of state takes place at any point in the liquid where bubbles form. The bubbles then rise and break at the surface of the liquid. Evaporation can take place at any temperature.
Why liquid tend has lowest surface area?
Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension. Molecules on the surface are pulled inward by cohesive forces, reducing the surface area.
Is vaporization that occurs only at the surface of a liquid?
Evaporation is a type of vaporization of a liquid that only occurs on the liquid’s surface. Usually, the molecules in a glass of water do not have enough heat energy to escape from the liquid.
What is it called when evaporation occurs beneath the surface of a liquid?
Vaporization that takes place below the surface of a liquid is called boiling. When a liq- uid boils, bubbles form within the liquid and rise to the surface, as shown in Figure 12. The temperature at which a liquid boils is called the boiling point.
What happens to the surface area of a liquid?
The unbalanced attraction of molecules at the surface of a liquid tends to pull the molecules back into the bulk liquid leaving the minimum number of molecules on the surface. It required energy to increase the surface area of a liquid because a larger surface area contains more molecules in the unbalanced situation. Adhesive Forces
How is the surface tension of a liquid measured?
Surface Tension Surface tension is measured as the energy required to increase the surface area of a liquid by a unit of area. The surface tension of a liquid results from an imbalance of intermolecular attractive forces, the cohesive forcesbetween molecules:
What are the forces of attraction between liquid and solid surface?
Adhesive Forces. Forces of attraction between a liquid and a solid surface are called adhesive forces. The difference in strength between cohesive forces and adhesive forces determine the behavior of a liquid in contact with a solid surface.
Why does liquid water have a concave surface?
Formation of a Meniscus. When liquid water is confined in a tube, its surface (meniscus) has a concave shape because water wets the surface and creeps up the side. Mercury does not wet glass – the cohesive forces within the drops are stronger than the adhesive forces between the drops and glass.