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Questions asked by users might not always be phrased in the clearest way.
Generally, as the volume of the gas in the syringe decreases, moving the piston and maintaining the volume becomes increasingly difficult. This is because as the volume decreases, the pressure inside the syringe increases, making it harder to compress the gas further. This observation can be explained by Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume, assuming constant temperature and number of moles.