A vacuum cleaner is a device that allows a vacuum to remove debris from floors, upholstery, curtains, and other surfaces. A specialized vacuum cleaner can be used in stores to extract both dust and liquids, as the vacuum cleaner uses an electric motor along with all the small particles in it connected, and pushes it towards the other. Vacuum cleaners work on the Bernoulli principle, which states that the faster the air, the lower the pressure. Air will always flow from a high pressure area to a low pressure area to try to balance the pressure.