What will be the shape of liquid meniscus for obtuse angle of contact?
Question: What will be the shape of liquid meniscus for obtuse angle of contact?
When a liquid is in contact with a solid surface, the shape of the liquid surface is determined by the angle of contact, which is the angle between the tangent to the liquid surface at the point of contact and the solid surface. For an obtuse angle of contact, which is greater than 90 degrees, the liquid meniscus will have a concave shape.
This is because the adhesive forces between the liquid molecules and the solid surface are stronger than the cohesive forces between the liquid molecules. As a result, the liquid is attracted to the solid surface and spreads out to form a thin film. The curvature of the liquid surface is such that the pressure inside the liquid is lower than the pressure outside, causing the surface to curve inward, resulting in a concave meniscus.
The shape of the liquid meniscus is important in many practical applications, such as in capillary tubes, where the shape of the meniscus can affect the flow of liquids. Understanding the relationship between the angle of contact and the shape of the meniscus is crucial for optimizing these processes and designing new technologies.
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