9781422271476

WORDS TO UNDERSTAND

contractor: a person or company that is hired for a certain period of time to provide services, goods, equipment, materials, or staff in order to meet an established goal respirator: an artificial breathing device that protects a person from inhaling dust, smoke, or other toxic substances sanitation: having or providing access to facilities and systems for the safe disposal of human waste sprinkler system: a fire protection structure that typically runs along the ceiling and shoots out water when high heat from a fire is detected union: an organization that seeks to gain better wages, benefits, and working conditions for its members; it is also called a labor union or trade union water softener: a device that removes hard minerals, such as calcium and magnesium, from water; hard water can cause a scaly buildup on pipes, heating elements in appliances, dishes, and even our skin

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