Vacuum cleaners are another household appliance that most people have encountered at some point in their lives. The idea behind how a vacuum cleaner works is pretty simple.
The fan of the vacuum cleaner rotates pushing air particles forward out of the vacuum. This creates an air pressure that is higher outside of the vacuum than inside. Air particles want to move from areas of higher pressure to lower pressure. Becuase the air pressure is higher outside of the vacuum, air is sucked through the bottom of the vacuum. The air moves through the vacuum bag and is pushed back out by the fan.
As air moves through the vacuum the air particles collide with dirt and other debris on the floor or in the carpet. If there is enough friction between the colliding particles the dirt gets carried into the vacuum with the air. Vacuum bags are porous and air is able to pass through but dirt particles are to large and get caught in the bag.
Although there are many different models of vacuum cleaners, the same principles apply.
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