<h2 dir="ltr">Introduction to Surface Tension</h2>
Surface tension is the physical phenomenon that involves the surface of a liquid behaving like an extended elastic membrane. It arises due to the cohesive forces between liquid molecules. This property has the effect of the liquid behaving in such a way as to reduce its surface area, hence the spherical droplets of water.
<h2 dir="ltr">Formula For Surface Tension&nbsp;</h2>
The formula for finding surface tension is given as,
<img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXfGjYbxclsQ2RhguKs5QD0_Xe5kVpc0s2EucPNg2ZXaujNeEAJAseu567xOr_Uh4BnJJsAc7kY73LCkb7M6Wpg-_mymFEt8iakcIyKZjy8NyhyiuiIZQ8HS7q1jCx8nCEKPeiJFZbZgwOK83RPF86CK9z_Z?key=IiWC3yNOgBEJhSb4XMrpDw" alt="surface tension formula" width="63" height="51">
Where,
<ul>
<li dir="ltr" aria-level="1">
T= surface tension(N/m)
</li>
<li dir="ltr" aria-level="1">
F = force per unit length (N)
</li>
<li dir="ltr" aria-level="1">
l=length in which force acts(m)
</li>
</ul>
<h2 dir="ltr">Surface Tension Solved Problems</h2>
Solved numerical related to surface tension are provided given below:
Problem 1: Calculate the surface tension of a given liquid whose dragging force is 5N and length in which the force acts is 2cm?
Solution:
Known values are,
F = 5N and L= 2cm
The formula for surface tension is
<img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXdt3SUKUWv6xY-EI8ZKoNes-S5goiLhmpI4Be3YsetoLLru_NO-InZhxLq6aGgpdlV9wJqbdShcuJSJtDNj4f7TydJ2FsQJkq-Eo5A8BqxOArk7h52tc0B5rbqurrNfT-dO0VjHM53VVOPPusrpaWAap9nF?key=IiWC3yNOgBEJhSb4XMrpDw" width="105" height="132">
Problem 2: The film of a soap is stretched across a wire frame and exerts a force of 0.02 N. The length of the film is 0.05 m. Calculate the surface tension of the soap film,&nbsp; knowing that this film has two surfaces.
Solution:
<img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXe001geFMfeEdO4iolxUd1rnSkZp208iqIvSrJKUfTAVoUT5_XTpwGtHN8j7cZT3rwO3_pMdnfwQEw0EQtCkeExnSKcr_T4umLtIs3sdBkVg9HFRhH_mN0zSMoybUpngr-UVr6gFPoW8juKZuCZn_cmoUQ?key=IiWC3yNOgBEJhSb4XMrpDw" alt="surface tension formula" width="62" height="32">
Formula for surface tension is:&nbsp;&nbsp;
Use the formula for surface tension, making notations that the soap film has two surfaces:&nbsp;&nbsp;
&nbsp;&nbsp; <img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXeQlhaLGfzhouWf_VCWlPJ8WyKe3Ds8X7wbtu-rKe64SBZ1l9--hA7aYsCEcawHAXMwC9JVIOBmoRAG378H6GbI7a5QK1BVqIsJeZk-Q_pq5SK-dM2bfnv3gNSRc_ttFzE7kxr_rumYeHbrfWUGG3ou54le?key=IiWC3yNOgBEJhSb4XMrpDw" alt="surface tension formula" width="84" height="36">
Known values are,
F = 0.02N and l= 0.05
<img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXc1-NAZfNaEe4_v3p2R3EOpIe4LU_sDbr62qFTBOQBhhanH2KrkWQtsKY7MVi_SI2fy8DbakShC-FwDNrEBEiJAQkM2nWeQN0m-ImWj5hlOJyX2yxQBOlmsjiNVRWIkZxy-bGIjhpe6fbUXBIiyXzpYVchM?key=IiWC3yNOgBEJhSb4XMrpDw" alt="surface tension formula" width="123" height="156">
Therefore,
Surface Tension =0.2 N/m
&nbsp;
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Surface Tension Formula

Understand what is the Surface Tension, Learn about the Surface Tension Formula in physics, and get the solved examples at Orchids International School.