Final answer:
An air gap is a physical space that prevents contaminated water from flowing back into the drinkable water supply system.
Step-by-step explanation:
The contamination of drinkable water supply systems can be prevented through the use of an air gap. An air gap is a physical space that prevents contaminated water from flowing back into the drinkable water supply system.
An air gap is a physical space that prevents contaminated water from flowing back into the drinkable water supply system. It is created by ensuring there is a vertical gap between the water source and the point where the water enters the system.
For example, in plumbing systems, an air gap can be created by having a gap between the faucet and the sink or countertop. This prevents any potential contaminants in the sink or countertop from entering the water supply.