Vacuum Cleaner

Vacuum cleaner
A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors, and optionally from other surfaces as well. The dirt iscollected by either a dustbag or a cyclone for later disposal. Vacuum cleaners, which are used in homes as well as in industry, exist in a variety of sizes and models— small battery-operated hand-helddevices, domestic central vacuum cleaners, huge stationary industrial appliances that can handle several hundred litres of dust before being emptied, and self-propelled vacuum trucks for recovery oflarge spills or removal of contaminated soil.
Wet/Dry
Wet or wet/dry vacuum cleaners are a specialized form of the cylinder/drum models that can be used to clean up wet or liquid spills. They commonlycan accommodate both wet and dry soilage; some are also equipped with a switch or exhaust port for reversing the airflow, a useful function for everything from clearing a clogged hose to blowing dustinto a corner for easy collection.
Pneumatic
Pneumatic or pneumatic wet/dry vacuum cleaners are a specialized form of wet/dry models that hook up to compressed air. They commonly can accommodateboth wet and dry soilage, a useful feature in industrial plants and manufacturing facilities.
Backpack
Backpack vacuum cleaners are commonly used for commercial cleaning: they allow the user to moverapidly about a large area. They are essentially small canister vacuums strapped onto the user's back.
Drum
Drum or shop vac models are essentially heavy-duty industrial versions of cylinder vacuumcleaners, where the canister consists of a large vertically positioned drum which can be stationary or on wheels. Smaller versions, for use in garages or small workshops, are usually electricallypowered. Larger models, which can store over 200 litres (53 US gallons), are often hooked up to compressed air, utilizing the Venturi effect to produce a partial vacuum.
Canister
Canister models (in...