Fire load in a building is given in:

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Fire load is the potential heat energy released by all combustible materials in a space per unit area. Because it describes energy per floor area, the normal unit is pounds of combustibles per square foot (lb/ft^2). This density helps inspectors and designers assess fire growth potential, ventilation needs, and required fire-resistance for barriers.

The other units don’t fit because pounds per square inch measures pressure, not energy per area, and is unrelated to how much combustible material is present per area. Pounds per occupancy load ties energy to the number of people rather than to the amount of fuel, which isn’t how fire load is quantified. Pounds per combustible medium isn’t a standard metric for fire load and doesn’t convey energy density per area. For example, if a room contains 500 pounds of combustibles spread over 100 square feet, the fire load is 5 lb/ft^2.