In fire protection design, density is defined as the amount of water per unit area required by the hazard.

• A. True
• B. False
• C. Not defined
• D. Irrelevant

Answer: (A)

In fire protection design, density refers to how much water must be applied to a defined area of the hazard, expressed as water per unit area (for example, gpm per ft^2 or L/min per m^2). This concept is used to ensure the protected area receives enough water to control or suppress the fire. The statement is true because the design process specifies a density based on the hazard and then uses the hazard’s design area to determine the required discharge. For example, a design density of 0.2 gpm/ft^2 over 1,000 ft^2 requires about 200 gpm to that area. The focus is on water per area, not on total water for the entire building or per head, which is why this answer best matches the standard definition.