In the history, at the time of British rule in 1800's, the island of Sri Lanka formerly known as Ceylon. It is a south asian country located in the northest of the indian ocean.
When heated any substance, the molecules move apart from each other. Alike in the air the molecules move apart from each other. We know that the warm air is lighter than the cool air. Since after heating air gets warmer, it floats up and the cool air comes down to occupy the warm air place.