Plunger is a disc or cylinder that moves in the body of a syringe, a pump or the cylinder of a steam engine, an explosion engine.
The substance in the cylinder
The substance that you think is in the cylinder that you cannot see and that prevents the plunger from going all the way in, even when you push the plunger hard, it may be substance that is too viscous or dense, but it is not possible to determine substance.
With this information, we can conclude that the plunger is a disc or cylinder that moves in the body of a syringe, but the substance to be determined can be viscous or dense.
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