Dry, clean air normally has a dielectric strength of about __________ volts per inch.

Dry, clean air has a relatively high dielectric strength, meaning it can withstand a significant voltage before breaking down and allowing electrical current to pass through. The commonly accepted value for the dielectric strength of such air is approximately 10,000 volts per inch. This characteristic is crucial for electrical engineering and safety as it informs the design of electrical equipment, ensuring that it can operate effectively without arcing or shorting under normal conditions.

In situations involving high voltages, maintaining sufficient distance or using materials with adequate dielectric strength is essential to prevent electrical breakdown. The value of 10,000 volts per inch reflects the capability of dry and clean air to insulate against electric fields until they reach a level where ionization occurs, allowing current to flow, which is pivotal for high-voltage applications and systems.