Compared to fog nozzle streams, smooth-bore nozzle streams primarily __________.

Smooth-bore nozzle streams primarily absorb less heat compared to fog nozzle streams due to their larger, more solid stream of water. When water is discharged from a smooth-bore nozzle, it creates a more cohesive, focused water stream. This results in less surface area being exposed to the surrounding environment and thus reduces the amount of heat absorbed by the water as it travels to the target.

Additionally, smooth-bore nozzles deliver water in larger droplets that are heavier and have more momentum, allowing them to penetrate deep into a fire environment. This efficiency can help in cooling the combustion gases more effectively in the target area without absorbing as much heat during transit.

This property contrasts with fog nozzle streams, which break the water into smaller droplets. While the increased surface area of fog streams can be beneficial for certain applications, it also facilitates greater heat absorption as the water spends more time in contact with hot gases before reaching the fire. In scenarios where heat absorption is a critical factor, smooth-bore nozzles can offer advantages for direct attack strategies.