How long does it take for the expanding gases from an RPG-7 explosion to form?

The correct timeframe for the expanding gases from an RPG-7 explosion to form is indeed approximately 1/10 of a second. When an RPG-7 is fired, the propellant ignites, and the rapid combustion produces a large volume of gas almost instantaneously. This gas expands rapidly, creating pressure that propels the warhead towards its target.

The duration of 1/10 of a second illustrates the speed of this process, indicating how quickly the combustion and subsequent expansion of gases occur. This rapid formation is crucial for the effectiveness of the weapon, as it allows for fast propulsion and minimized reaction time for the target.

Options that suggest significantly shorter durations, such as 1/100 of a second or 1/1,000 of a second, underestimate the physical processes involved, as these timeframes do not adequately account for the complete combustion of propellant and formation of gases necessary for propulsion. Therefore, 1/10 of a second reflects an accurate understanding of the rapid nature of explosive reactions in the context of an RPG-7.