Property that matter has to return to its initial volume - after the force that causes the compression has ceased.
The plunger is being pushed into the air outlet of the syringe, but this outlet is blocked by the finger. The plunger, when released from the force to which it was subjected, returns to the initial position on the syringe, and this shows the elasticity of the air.
Property that matter has to be reduced to extremely small particles.
Matter cannot be created or destroyed, only transformed.