Vacuum Cleaner
A vacuum cleaner, commonly referred to as a "vacuum,"
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 is collected 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-held devices, 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 of large spills or removal of contaminated soil.
