What route of exposure can result from high pressure gases or liquids entering the body?

High pressure gases or liquids can result in the route of exposure known as injection. When these substances are released under high pressure, they can penetrate the skin or other tissues, creating a direct pathway into the bloodstream or underlying tissues. This form of exposure can cause significant injury and medical complications, as it bypasses the body's natural barriers designed to keep harmful substances out.

Inhalation is associated with airborne particles or gases, while ingestion pertains to substances taken into the digestive system, both of which differ significantly from injection. Skin absorption involves compounds that permeate through the skin but does not involve high pressure; thus, it is also not relevant to this situation. Understanding the mechanics of how high pressure can lead to injection aids in appreciating the dangers of working with these materials and the need for appropriate safety measures.