Conceptual question on Surface Tension

In summary, the question asks if the contact of an air bubble with a solid surface, with a 90 degree contact angle, affects the bubble volume. The solution considers the absence of hydrostatic pressure and any exchange of molecules between the bubble and water phase. It is concluded that, according to Young's Equation, the radius of curvature of the bubble should remain the same as there is no change in any of the interface tensions.
  • #1
Otaku123445
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Homework Statement



An air bubble rises in water and makes contact with a container wall. Does contact with the solid surface change the bubble volume even if the surface is neither hydrophilic nor hydrophobic, but forms a contact angle of 90 degrees with the air-water interface?(Neglect Hydrostatic pressure and any net exchange of molecules between the bubble and the water phase)

Homework Equations



Young's Equation
Tsl+ Tlv costheta= Tsv
T=tension
sl=solid liquid interface
lv=liquid air interface ; sv=solid vapor interface; theta=-contact angle

The Attempt at a Solution


I know for sure that if hydrostatic pressure is taken into account, then as the bubble rises it expands. But, in the absence of pressure as it hits the container there is only tension forces. But, I'm not sure if the radius of curvature of bubble will be larger, smaller or remain same.
 
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  • #2
I think on the basis of Young's equation, it should remain same as there is no change in any of the interface tensions. Am I right?
 

FAQ: Conceptual question on Surface Tension

1. What is surface tension?

Surface tension is the force that causes the molecules on the surface of a liquid to be pulled together, creating a "skin" on the surface of the liquid. This force is caused by the cohesive forces between these molecules.

2. How does surface tension affect the behavior of liquids?

Surface tension affects the behavior of liquids in several ways. It allows small insects, such as water striders, to walk on the surface of water. It also causes liquids to form droplets rather than spreading out in a thin layer. Additionally, surface tension can create capillary action, which is the movement of liquids through narrow spaces or tubes.

3. What factors affect the surface tension of a liquid?

The surface tension of a liquid can be affected by several factors, including the type and strength of intermolecular forces between molecules, temperature, and the presence of impurities or contaminants. For example, adding soap to water can decrease its surface tension due to the disruption of cohesive forces by the soap molecules.

4. How is surface tension measured?

Surface tension is typically measured using a tensiometer, which measures the force required to pull a wire or needle out of the surface of a liquid. This force is then used to calculate the surface tension of the liquid.

5. What are some real-life applications of surface tension?

Surface tension has many practical applications in everyday life. It allows insects to walk on water, helps plants absorb water from their roots, and allows liquids to form droplets, making it easier to clean surfaces. Surface tension is also important in the functioning of our lungs, as it helps keep the alveoli in our lungs from collapsing. In industry, surface tension plays a role in processes such as painting, printing, and foam production.

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