Final answer:
A solid stream fire hose pattern produces less steam conversion and less heat absorption per gallon due to its lower surface area exposure to heat.
Step-by-step explanation:
The fire stream pattern that produces less steam conversion and less heat absorption per gallon (liter) is the B. Solid stream. This is because a solid stream has a coherent stream of water that minimizes surface area exposed to the fire's heat compared to the other patterns. Lower surface area results in less evaporation and, consequently, a reduced rate of steam conversion and heat absorption. Whereas patterns such as fog-stream (A) and broken-stream (C) break the water into smaller droplets, which increases the surface area exposed to the heat and encourages more evaporation and cooling. A straight stream (D) is somewhat similar to a solid stream but can break up slightly upon contact with surfaces or air resistance.