Final answer:
The subject of this question is Health. The unit being described is called an eyewash station, which provides a gentle stream of water for emergency irrigation to remove contaminants from the ocular area.
Step-by-step explanation:
Definition:
The subject of this question is **Health**.
Detailed Answer:
The unit being described in the question is called an **eyewash station**, which is used for emergency irrigation to remove contaminants from the ocular area. Eyewash stations are a necessary backup in case of accidents involving exposure to chemicals and other irritants. They provide a gentle stream of water to help flush out harmful substances from the eyes.
Example:
An example of where eyewash stations are commonly found is in science laboratories, where students and researchers work with chemicals that can be hazardous to the eyes. In case of accidental splashes or spills, eyewash stations provide a quick and accessible means of rinsing the eyes.