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While measuring surface temsoion of wat...

While measuring surface temsoion of water using capillary rise method, heihgt of the lowr meniscus from free surface of water is 3 cm while inner radius of capillary tube is found to be `0.5` cm. Then compute tension of water using this data. (Take contact angle between glass and water and a 0 and `g=9.81 m//s^(2)`

A

`0.72 N//m`

B

`0.77 N//m`

C

`1.67 N//m`

D

None of the above

Text Solution

Verified by Experts

(b) As , T `(r(h+(r)/(3))rhog)/(2 costheta)`
`=(0.5xx10^(-2)[3+(0.5)/(3)]xx10^(-2)xx10^(3)xx9.81)/(2)=0.77N//m`
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