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The surface tension of water at 20^@C is...

The surface tension of water at `20^@C` is 72 dyn. `cm^-1`. And for water `(dT)/(dtheta)=-0.146 dyn. Cm^-1 . K^-1.` What is the total surface energy of water?

Text Solution

Verified by Experts

We know that the total surface energy of water,
`E=T-theta(dT)/(dtheta)=72-293xx(-0.146)[20^@ C=293 K]`
`=72+42.778 = 114.778 erg. Cm^-2`.
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Knowledge Check

  • The surface tension of water at 20^@C is 72.75 dyne cm^(-1) . Its value in SI system is

    A
    `2.275N m^(-1)`
    B
    `0.7275N m^(-1)`
    C
    `0.07275Nm^(-1)`
    D
    none of the above

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