Pressure, temperature and volume interact with one another as shown by the equation: PV = nRT. Pressure and volume are inversely related while pressure and temperature are directly proportional. This can be seen through an example using a fire syringe. A fire syringe is a simple glass cylinder with a piston that pushes down inside. When a small piece of gun powder cotton is placed inside and the piston is pushed down quickly, the cotton ignites and a spark can be seen. The science behind it lies in the aforementioned equation. When the piston is moving down, the volume is decreasing. With this drop, the pressure starts building up. The pressure causes the temperature to start increasing. This makes the gun cotton powder to ignite, causing a spark.
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