Why do we say that there is always an excess pressure on the concave side of the meniscus of a liquid.
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Answered by
24
There are two forces involved in capillary action which dictate the curvature of the meniscus.
1. The adhesion of the molecules to the surface of the container - so water adheres to glass which drags the sides of the meniscus upwards
2. The cohesion of water which glues the surface of the water together as in raindrops.
So the shape of the meniscus is the balance, basically, of these two forces.
Naturally if a tube is thin the grip on the sides of the tube pulling the water upwards overcomes the force caused by gravity and pulls the water upwards. There are a few models for this but interestingly none of them exactly predict experimental results.
There a few complexities which I have left out for the sake of brevity
1. The adhesion of the molecules to the surface of the container - so water adheres to glass which drags the sides of the meniscus upwards
2. The cohesion of water which glues the surface of the water together as in raindrops.
So the shape of the meniscus is the balance, basically, of these two forces.
Naturally if a tube is thin the grip on the sides of the tube pulling the water upwards overcomes the force caused by gravity and pulls the water upwards. There are a few models for this but interestingly none of them exactly predict experimental results.
There a few complexities which I have left out for the sake of brevity
Answered by
3
Answer--- for a curved liquid surface to be in equilibrium
the pressure on its concave side is greater than the pressure on its convex side.
Explanation:
This is correct Answer
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