Final answer:
The explosive strength of detonating cord is expressed by the speed of the detonation wave, measured in meters per second, which reflects the sensitivity and power of the explosive material within the cord such as RDX or TNT.
Step-by-step explanation:
The explosive strength of detonating cord is typically expressed in terms of the speed at which the detonation wave travels along the cord, which is measured in meters per second (m/s). Detonating cord is a flexible tube filled with a high-explosive material that explodes in a controlled manner when initiated. This speed of detonation is related to the type and amount of explosive material used in the cord, and is an important characteristic of the cord's performance.
The explosive material often used in a detonating cord could be RDX or a mixture involving TNT. While TNT had an Figure of Insensitivity (F of I) rating of 100, it has now been surpassed by RDX, which has an F of I rating of 80. This reflects the sensitivity and potential explosive power of the material in comparison. The actual efficiency and power of the explosive is observed upon detonation, involving a complex chemical reaction that releases heat and gases, contributing to the explosive effects.