Surface Tension

♦Surface Tension (σ)♦

● It is due to cohesion between the surface molecules of liquid that its surface acts on elastic membrane which can resist small tension.

● The property of the liquid which enables it to resists tensile stress is called as surface tension.

● Surface tension is the force required to maintain unit length of the liquid film in equilibrium and expressed in N/m.

● The property of liquid to supports small objects like dust particles, insects etc. 

Surface tension depends upon cohesion which decreases with the temperature rise, so surface decreases with the temperature rise. 

● It is also dependent upon the fluid in contact with the liquid surface and is usually quoted in contact with air.   

🔸 It is force per unit length (N/m)

🔸 It is due to cohesion only.

🔸 For water-air interface at 20 ℃ it's value is 0.0736N/m.

📌 Pressure inside jet :- 2σ/d

📌 Pressure inside drop (sphere) :- 4σ/d

📌 Pressure inside bubble :- 8σ/d

Join Telegram ▶️  @civilbhai