What characteristic of nylon rope is pertinent for ballooning purposes?

The pertinent characteristic of nylon rope for ballooning purposes is its ability to stretch. When used in ballooning applications, this stretching quality can absorb shocks and loads that occur during flight, especially during changes in altitude or in response to wind. This elasticity helps protect the balloon and its attachment points from sudden forces that could lead to failure.

While other characteristics of nylon, such as being lightweight or resistant to water, are beneficial in various contexts, they do not directly address the specific demands and dynamics faced in ballooning. Fire resistance, although valuable in many environments, is also not a primary concern when considering the operation of lighter-than-air craft. Therefore, the stretching capacity of nylon rope emerges as the most crucial feature for ensuring safety and functionality in ballooning scenarios.