Propane is typically transported in liquid form because it is more compact and easier to store and transport. When propane is in a liquid state, it takes up less space, making it more efficient to transport large quantities. Additionally, liquid propane is denser than gaseous propane, allowing for more propane to be transported in a given volume. This makes it more economical to transport propane over long distances.

While propane can also be transported in gaseous form, it requires more energy to compress the gas and maintain it at a high pressure. This makes transporting gaseous propane more expensive and less efficient. Furthermore, gaseous propane is more flammable and explosive than liquid propane, making it more dangerous to transport.

For these reasons, it is generally safer, more efficient, and more economical to transport propane in a liquid state.