Surface Tension Help i Cant Understand

In summary, the book explains that interfacial tensions are lower than surface tensions because the adhesive forces between two liquid phases forming an interface are greater than when a liquid and a gas phase exist together. This concept can also be referred to as interfacial energy, which can vary from low (wetting) to high (partial wetting or nonwetting) or even negative (diffusion).
  • #1
bestfmuzik
1
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Clarification on surface and interfacial tension?
Interfacial tensions are less than surface tensions...
The reason given in book is :-
because the adhesive forces between two liquid phases forming an interface are greater than when a liquid and a gas phase exist together.

I don't understand this ...Why interfacial tension is low ...?
 
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  • #2
bestfmuzik said:
Clarification on surface and interfacial tension?
Interfacial tensions are less than surface tensions...
The reason given in book is :-
because the adhesive forces between two liquid phases forming an interface are greater than when a liquid and a gas phase exist together.

I don't understand this ...Why interfacial tension is low ...?

'Interfacial energy' is often used interchangeably with 'surface tension'. Strictly speaking, 'surface tension' refers to the interface between a substance and vacuum- in this sense, it's a limit.

Interfacial energy can be low (wetting), high (partial wetting or nonwetting), and even negative (diffusion).
 

1. What is surface tension?

Surface tension is a physical property of the surface of a liquid, which allows it to resist external forces and hold its shape. It is caused by the cohesive forces between the molecules of the liquid, which creates a thin layer with higher surface energy.

2. How is surface tension measured?

Surface tension is typically measured in units of force per length, such as newtons per meter (N/m) or dynes per centimeter (dyn/cm). It can be measured using a variety of methods, including the drop weight method, capillary rise method, or Wilhelmy plate method.

3. What factors affect surface tension?

Surface tension is influenced by several factors, including temperature, pressure, type of liquid, and presence of impurities. Higher temperatures and pressures generally decrease surface tension, while impurities can either increase or decrease it depending on their nature.

4. Why is surface tension important?

Surface tension plays a crucial role in many natural phenomena, such as capillary action, water striders' ability to walk on water, and the formation of droplets. It also has practical applications in various industries, including the production of detergents, paints, and food products.

5. How can I better understand surface tension?

To understand surface tension better, you can conduct simple experiments at home, such as observing the shape of water droplets on different surfaces or comparing the surface tension of different liquids. You can also learn about the molecular forces that contribute to surface tension and how they are affected by various factors.

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