Flammable liquids may only be used when there are no open flames or ignition sources within how many feet?

The correct distance for using flammable liquids without open flames or ignition sources is 50 feet. This guideline is established to ensure safety and mitigate the risk of fire hazards in environments where flammable liquids are utilized. Keeping a designated distance of 50 feet helps to reduce the likelihood of an ignition source coming into contact with flammable vapors, which can be present even if the liquid itself is not ignited.

This safety measure is crucial in various settings, including warehouses, laboratories, and construction sites, where flammable liquids may be stored or used. Adhering to this distance helps create a safer work environment and complies with regulatory standards that mandate specific precautions when handling hazardous materials.

The other options represent distances that are either too short or impractical for effective safety management when dealing with flammable substances.