Concepts: vacuums, air pressure
Skills: observing, critical thinking
Safety First! Do not use a plastic bag. It could get sucked into the vacuum. Keep hands away from vacuum hoses and follow all safety instructions provided with your vacuum.
A vacuum cleaner is a form of technology. Technology is something that people create to solve problems. Vacuum cleaners pull air in and the air sucks up dirt and dust.
Inside vacuum cleaners a fan blows air (you can often feel it). In order for a fan to blow air, it needs to draw air in. This is the air that sucks up, or vacuums, the dirt and dust.
The low pressure air caused by the air going into the vacuum cleaner draws up small objects which then get trapped in bags, canisters or filters.
Why does it matter?
Vacuum cleaners use low air pressure to help us pick up small particles of dirt and dust. Vacuum suction is also used in many industries to move materials around. A milking machine uses low air pressure (vacuum pressure) to create suction to milk a cow. The milk can also be moved to a large holding tank using vacuum pressure.