Which feature helps in activating an EWARP soft patch effectively?

The correct feature that helps in activating an EWARP (Emergency Water Activated Repair Patch) soft patch effectively is the presence of salt water. EWARP is designed to be activated when it comes into contact with water, and salt water specifically enhances the patch's bonding properties and effectiveness when repairing leaks in pipes.

The composition of EWARP includes materials that swell and adhere better in saline environments, making it particularly effective for use in seawater situations often encountered on naval vessels. When salt water activates the patch, it facilitates a quick and reliable seal that can withstand the pressure and flow of leaking fluids.

In contrast, other elements such as clean water or high pressure may not provide the same level of activation or bonding required for optimal performance of the EWARP patch in practical scenarios. Rapid temperature changes can also impact the integrity and performance of the patch, but they do not directly relate to the activation process as effectively as salt water does.