A ring is cut from a platinum tube 8.5 c...

A ring is cut from a platinum tube `8.5 cm` internal and `8.7 cm` external diameter. It is supported horizontally from the pan of a balance, so that it comes in contact with the water in a glass vessel. If an extra `3.103 g.f.` is required to pull it away from water, the surface tension of water is

`72"dyne cm"^(-1)`

`70.80"dyne cm"^(-1)`

`63.35"dyne cm"^(-1)`

`60"dyne cm"^(-1)`

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