Surface tension and the effect of temperature on them

Introduction

Surface Tension

Surface tension is the energy or work required to raise the surface area of a liquid due to intermolecular forces. Because the composition of the liquid (e.g., water vs gasoline) and the solutes in the liquid (e.g., surfactants like detergent) influence these intermolecular pressures, each solution has different surface tension features. Surface tension is something you’ve probably noticed at work. For example, when a glass of water is overfilled, the level of the water in the glass is higher than the glass’s height. Another example is when spilt water forms pools on the counter. Surface tension is responsible for both of these occurrences.

Let’s look at surface tension in more detail with several instances, as well as the effect of temperature on surface tension.

Body

Due to the cohesive nature of its molecules, surface tension is also a feature of a liquid’s surface that permits it to resist an external force. As a result of the forces of cohesion between liquid molecules, the surface tension phenomenon occurs. It is still true that molecules at the surface of a glass of water tend to attract molecules nearby and below them (in this case, next to and below them) despite being surrounded by other molecules. Water does not develop a “skin” over its surface because it is more cohesive than air, which makes it harder to move objects through its surface than if they were submerged entirely.

Surface tension examples

• Walking on water: Because their weight is insufficient to penetrate the surface, little insects like the water strider may walk on water.
• Floating a needle: Even though it is several times as dense as water, a precisely placed little needle may be made to float on the surface of the water. The needle will descend quickly if the surface is disturbed to break up the surface tension.
• Don’t get your hands on the tent! : The surface tension of water will bridge the pores of finely woven tent fabrics, making them slightly rainproof. However, if you press your finger on the tent material, the surface tension is broken, and rain will trickle through.
• A urine sample with no bile has a surface tension of about 66 dynes/centimetre, whereas one with bile drops to about 55 dynes/centimetre. Powdered sulphur is dusted on the urine surface in the Hay test. It floats in regular pee but sinks in bile because the surface tension is reduced.
• Low-surface tension surfaces are typically surface tension disinfectants. They allow bacteria to spread out and disrupt their cell walls allowing them to remain alive.
• Soaps and detergents assist clean garments by reducing the surface tension of the water, allowing it to penetrate pores and dirty areas more easily.
• Hot water is better for washing than cold water because it has lower surface tension and is easier to wet. The detergent may not need to be heated, however, if it lowers the surface tension.
• Why are bubbles round? Bubbles in water are formed by the surface tension of water. The desire to reduce wall strain causes the bubbles to form spherical forms.
• Droplets and surface tension: The form of liquid droplets is determined by surface tension. The cohesive forces of the surface layer tend to draw water droplets into a spherical shape, despite their ease of deformation.

What is the significance of surface tension?

• The stability of food products is determined by interfacial tension.
• The performance of medicinal substances is influenced by surface and interfacial tension.
• The key factor in improved oil recovery is interfacial tension.
• Surface tension optimization of paints results in defect-free coatings.
• The efficiency of the detergent formulation is determined by surface tension.

The effect of temperature on surface tension

Surface tension is a feature of liquids that causes them to operate as a stretchy membrane. Surface tension is caused by the attraction of molecules in all directions, causing the liquid’s outermost layer to operate as an elastic membrane. Because surface tension is determined by the intermolecular forces between liquid molecules, as the temperature rises, the molecules gain more energy and become more active, moving randomly. As the temperature rises, the molecule becomes more unstable, reducing the strength of the liquid’s outermost membrane. Thus, the surface tension decreases.

Conclusion:

Because cohesive forces drop as molecule thermal activity increases, we can deduce that surface tension reduces as temperature rises. The sticky action of liquid molecules at the contact causes the effect of the surrounding environment.