Answer:
Volume of air increases.
Step-by-step explanation:
The volume of air increases in the syringe when the syringe is placed in hot water because the volume of air increases when the temperature is increases. According to Charles's Law which states that, at a fixed pressure, the volume of a given amount of gas is directly proportional to its temperature so if there is increase in temperature so the the volume of gas present in a container or syringe increases and vice versa.