Pressure Inside a Liquid Drop and a Bubble
For any small drop of water, it does not collapse because of Surface Tension on the surface of the water which is given by,
σ = F/L
where,
- σ is surface tension of the liquid
- F is force per unit length
- L is line over which the force acts
If the drop doesn’t collapse, it implies that the pressure within the drop is greater than that outside. The extra pressure (p) is given by subtracting the outside pressure (po) from the inside pressure (pi);
p = pi – po
Outside Force = p × Surface Area of Drop
Outside Force = (pi – po) x 4πr2
where,
- r is radius of the drop
Also, Read
Surface Energy Formula
Surface energy quantifies the disruption of intermolecular bonds that occurs when a surface is created. It is also called surface-free energy or interfacial-free energy. In simple language, surface energy can be defined as the work per unit area done by the force that creates the new surface.
Surface energy is the energy that exists between the surface molecules of solid materials or substances when a comparable attractive force exists. The Ratio of Surface Energy to the Surface Area is known as Surface Tension. Low to high energies, or vice versa, are different. It is impossible to measure surface energy. It occurs as a result of a molecule-molecule interaction. A stretched membrane refers to the free surface of a liquid. The surface, which is known as surface-free energy, holds some Potential Energy on the liquid surface. Surface energy will be discussed in detail in this article.
Table of Content
- What is Surface Energy?
- Unit and Dimension of Surface Energy
- Surface Energy Formula
- Relationship Between Surface Tension and Surface Energy
- Pressure Inside a Liquid Drop and a Bubble
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