Final answer:
The function of a syringe can be explained using Boyle's Law. When drawing a blood sample, the increase in volume decreases the pressure inside the syringe, allowing the blood to be pulled in. When giving an injection, the decrease in volume increases the pressure, forcing the liquid medication out.
Step-by-step explanation:
The function of a syringe can be explained using Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume.
When a syringe is used to draw a blood sample, the plunger is pulled back, increasing the volume inside the syringe. According to Boyle's Law, this increase in volume will decrease the pressure inside the syringe, creating a pressure difference that allows the blood to be pulled into the syringe.
Similarly, when a syringe is used to give an injection, the plunger is pushed, decreasing the volume inside the syringe. This decrease in volume will increase the pressure inside the syringe, forcing the liquid medication to be released from the needle.