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Understand that by using a syringe is the good example of showing the air pressure movement. As you pull the syringe plunger out, there is an increase of fluid, and if you push it in, the chance of decreasing the fluid will happen. In this case, you will find the state of mass and volume. By comprehending the air pressure, firstly take a note to understand the properties of air. The force of air pressure in a syringe causes the reduce of weight when we try to raise the density of the air in a compressed manner. 
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