How much does copper expand when it vaporizes during an electrical arc blast?

Copper expands significantly when it vaporizes during an electrical arc blast due to the extreme temperatures generated by the arc. The correct answer reflects the scientific understanding of the behavior of metals under such conditions. When an electrical arc occurs, the temperature can reach thousands of degrees, which causes the copper to turn from a solid state into a vapor.

The factor of 67,000 times indicates the dramatic increase in volume when the metal transitions from a condensed state to a gaseous state. This expansion is crucial to understand because it highlights the potential hazards associated with an electrical arc blast. The rapid change in volume can lead to explosive bursts, producing shockwaves and potentially causing severe injuries or damage in the surrounding area.

Understanding this principle is essential for electrical safety as it informs training and preventive measures that should be implemented to safeguard against the dangers of arc flash incidents. It emphasizes the need for protective gear and proper safety protocols when working with electrical systems to mitigate the risks posed by these explosive vaporization effects.