What is the definition of static resistance in a draft system?

Static resistance in a draft system refers specifically to the resistance caused by the effect of gravity. This type of resistance is encountered in a draft system as beer moves from a storage location, such as a keg, to the serving faucet.

When beer is drawn from a keg, it must overcome the resistance posed by the weight of the liquid, especially when the keg is positioned below the serving point. This gravitational effect is a key consideration in the design of draft systems, since it impacts how efficiently beer can be dispensed.

The other options refer to different aspects of a draft system. For instance, resistance created by the cooling process pertains more to temperature-related factors rather than gravity. Resistance related to flow rates of beer connects to dynamic resistance, which reflects how the flow of beer changes with varying pressure and flow conditions. Resistance from carbonation levels deals with the pressure needed to maintain carbonation in the beer, rather than static effects from gravity.

Hence, the definition of static resistance aligns accurately with the impact that gravity has on the flow of beer in a draft system.