What is the physics behind vacuum cleaners?
A vacuum cleaner’s working is similar to what happens when you take a sip of juice from a straw. As you suck the air out, juice from the glass takes its place. This is because you are creating a space of empty matter with your mouth. Since matter has a tendency to occupy space, the juice will flow upward and into your mouth so long as you continue to suck.
Now apply this theory to a vacuum cleaner. The boxy part of the has a motor inside it that does the same job as your mouth. The rotating fan of the motor creates a vacuum and begins to suck in air through the suction nozzle at the end of a pipe.
Any dust that comes within range of the suction of the nozzle gets pulled into the pipe and is collected in a bag. There is a filter inside that prevents the dirt that escapes from the bag, from entering the motor. The two main types of vacuum cleaners are ones with a canister with a pipe attached to it or an upright one whose suction nozzle is at the bottom of the canister itself.
The next time you come across a vacuum cleaner, ask an adult to help you turn it on. Find different materials such as paper clips, a couple of coins, and a small pile of dirt. Test how close you have to go to the material in order for it to reach the grasp of the suction power.
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