Why do we use tar for protecting wooden fencing and posts placed in the ground ?

Wooden sheds, railings, posts and any structures which are to be exposed to the weather are usually
covered with a coating of tar, because water and tar do not mix. The water runs off the surface, and cannot
penetrate through the tar and rot the wood underneath, n the manufacture of coal-gas, the tar sinks to the
bottom of the water-tank because it is heavier than water and does not mix with it.

 

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