A liquid in a vessel is heated due to the process of convection. In convection heat is transferred by the actual movement of heated particles in upward direction. As the liquid is heated from below its density decreases and hence it rises up and cold liquid settles down and heated. This process continues till whole liquid is heated.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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