The water pressure is applied to retina should be no less than 55 pounds Per square inch what any qualities expresses the pressure (P) in pounds per square inch that Should be be supplied to a residence.

The qualities that express the pressure (P) in pounds per square inch that should be supplied to a residence include:

1. Water supply system: The quality and design of the water supply system, including the type of pipes used, their diameter, and the overall infrastructure, directly impacts the pressure delivered to a residence.

2. Elevation: The height of the residence above the water source or the water tower affects water pressure. Higher elevations usually experience lower water pressure due to gravitational forces.

3. Distance from the source: The distance between the residence and the water source can affect the pressure. Longer distances may result in pressure loss due to friction and resistance in the pipes.

4. Water source pressure: The pressure provided by the water source or the water utility company determines the initial pressure available for distribution to the residence. Higher source pressures result in higher pressure supplied to the residence.

5. Pumping systems: If a residence has a dedicated pumping system, the quality and capacity of the pump impact the pressure delivered.

6. Pressure regulators: Pressure regulators or pressure-reducing valves can be installed in the water supply system to control and maintain a specific pressure level for residential use.

7. Water demand: The volume of water consumed in the residence simultaneously affects the pressure. Higher demand can result in lower pressure if the supply system is not designed to meet peak usage.

Considering these qualities, a pressure of no less than 55 pounds per square inch should be supplied to a residence to ensure proper functioning of appliances, taps, and showerheads, and to meet the household's water needs.