Can spark discharges between two objects be prevented by eliminating the air gap through bonding?

Eliminating the air gap between two conductive objects by bonding can effectively prevent spark discharges. When objects are bonded, they are electrically connected, which allows for the equalization of electrical potential between them. This reduces the chance of a spark forming, as a spark typically occurs when there is a sufficient voltage difference across an air gap, leading to dielectric breakdown of the air and resulting in an electrical discharge.

By bonding the objects, any potential difference that could lead to a spark is mitigated, thus enhancing safety in environments where flammable materials are present. This is particularly important in preventing incendiary conditions that could lead to explosions. The bonding techniques must ensure a good electrical connection and may involve using conductive materials to maintain this connection effectively.

The other options do not accurately reflect the nature of spark discharge mechanisms and the effects of bonding. While specific materials and pressure differences can play a role in other contexts, the core principle that bonding eliminates the air gap—which is critical for spark discharge—is what makes the first choice valid.