What is a significant hazard associated with using oil or grease near oxygen?

Using oil or grease near oxygen presents a significant hazard because it may lead to an explosion. When oil or grease comes into contact with oxygen under high pressure or in the presence of an ignition source, a highly reactive situation can occur. The presence of oxygen enhances combustion; thus, when oil or grease is involved, it can ignite and potentially result in an explosive reaction.

In environments where oxygen is enriched, the risks are amplified, as the fuels can burn more vigorously and at higher temperatures. This combination poses an extraordinary danger in both industrial and welding operations where oxygen is used for cutting or welding purposes. Understanding this hazard is crucial for maintaining safety protocols and preventing catastrophic incidents.

The other options do bring up valid concerns related to the use of oil or grease, but they do not encompass the critical explosive hazard associated with their interaction with oxygen. For example, while personnel injury is a serious consideration, it does not capture the inherent risk of an explosion that can occur under the right conditions.