Final answer:
Hauling liquids in tankers requires special care mainly because of the potentially off-center center of gravity. The loaded tanker sits lower in the water due to the greater mass of the loaded vessel. Additionally, gas moves from an area of high pressure to one of low pressure.
Step-by-step explanation:
Hauling liquids in tankers requires special care due to the center of gravity considerations. When a liquid is carried in a tanker, the movement of the liquid can shift the center of gravity, making it higher, lower, or even off-center, depending on how the tanker is loaded and how the liquid moves within it. Therefore, one reason for the special care is the off-center center of gravity, which can lead to challenges in maintaining the equilibrium and stability of the vehicle.
The density of different liquids, such as oil versus water, plays a role in how a tanker sits in the water. Although oil has a lower density than water, a loaded oil tanker sits lower than an empty one because the overall mass of the tanker is greater when it is loaded, thereby displacing more water and requiring it to sit lower to remain buoyant.
To mention gas and pressures, it's important to know that gas moves from an area of high pressure to an area of low pressure. This concept is key in understanding many processes in both natural phenomena and various engineering systems, highlighting the importance of pressure differentials in directing the flow of gases.