Which of the following in not the unit o...

Which of the following in not the unit of surface tension ?

`"newton"//"metre"`

`"joule"//("metre")^(2)`

`"kg"//("second")^(2)`

`"watt"//"metre"`

Verified by Experts

The correct Answer is:

Surface tension `T=F//l " and" (Delta W)/(Delta A)` i.e., unit of surface tension is `Nm^(-1) " or" Jm^(-2)`
`(N)/(m)=(kg-ms^(2))/(m)=(kg)/(s^(2))`

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Surface tension of a liquid is a molecular phenomenon of liquids involving the force of cohension along the liquid molecules. It is scalar quantity and is numberically equal to the surface energy. Numerically, it is proved that the potential soluble salts and surfce active substance. Sparingly soluble salts and surface acitve substances decrease the surface tension of the liquid. However, the fairly soluble solutes increase the surface tension of the liquid. Surface tension of a liquid is independent of surface area but it depends on the intemolecular forces and the temperature. Which among the following is not the unit of surface tension ?

`"dyne"//"cm"`

`"newton"//m`

`J//m^(2)`

`erg//cm`.

dynes `cm^(-1)`

ergs/cm

joules `m^(-1)`

N`m^(-1)`

`Nm^2`

`Nm^-2`

`Nm^-1`

`Nm`