What exactly is a vacuum has two related meanings in physics and household appliance context. In physics, a vacuum is defined as space devoid of matter, where air pressure is much lower than atmospheric pressure, ideally with no particles at all, though perfect vacuum does not exist in nature, even outer space has few particles, so we talk about partial vacuum. A vacuum is created when air is removed from enclosed space. In household context, a vacuum or vacuum cleaner is an electrical appliance that uses partial vacuum to clean floors and surfaces by suction. It contains motor that drives fan, creating low pressure inside machine, causing higher pressure outside air to rush in through nozzle, carrying dust, dirt, and debris into filter bag or dust container. Modern vacuums include components like brush roll, filters including HEPA, hose, and attachments. There are types like upright, canister, stick, handheld, robotic, and wet-dry. So exactly, a vacuum is both empty space with no matter, and device that creates that low pressure to suck up dirt, making cleaning easier than manual sweeping.
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