The main advantage of using common plant names is ease of usage and common understanding in certain geographical areas and, conversely, the prevention of confusion among the laymen who do not understand Latin
.What are the disadvantages of common names?
These names may not be same every where in all places so in order to have universally similar name.
Creates confusion among different languages.
Cannot identify one particular species by common names.
Hot air is less dense therefore it rises. Cold air is more closely packed therefore it is more dense. Less dense things rise while more dense things sink.