What mode of transportation is limited to specialized products such as liquids and gases?

As the highways (trucks) are best suited fortransporting bulk products likewise water (ships) is also used to locate large amounts of products at a time but the water mode of transportation is very slow in delivery so mostly in logistics people prefer roadways mode of transportation. Other modes of transportationalso involve railways and transportation through pipes.

The air transportationmethod is very fast in delivery but is very expensive. So it is difficult to manage the air mode of transportation for logistics purposes. Even though many big logistics companies are using air transportation because of their high demand in the market and they can bear all the expenses involved in this process. This air transportation is also limitedto locating only particular materials.