Simplify the following text for a Grade 3 native English-speaking person.
Original: A gas syringe also known as glass collecting bottle , is a piece of laboratory glassware used to insert or withdraw a volume of a gas from a closed system , or to measure the volume of gas evolved from a chemical reaction .
Simplified: A gas syringe is a tool used in a laboratory . It is used to collect a gas or to measure the volume of a gas .