Students are investigating the relationship between pressure and temperature in gases. They have blown up a balloon with carbon dioxide from an air tank and connected the balloon to a pressure gauge. The balloon is then submerged in ice or water baths at various temperatures in order to observe the pressure level after several minutes. What is the flaw in the student’s investigation, and how can the students improve their investigation to correctly determine the relationship? A.
The volume and density of the air in the balloon can change, therefore they need to use several different balloons at different volumes to account for how density and volume affects pressure.

B.
The volume of the balloon can change, therefore they need to use several different balloons at different volumes to account for how volume affects pressure.

C.
The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.

D.
To keep the volume of the balloon from changing, so they can focus on temperature and pressure they need to use a container that does not expand like a balloon. A constainer made of plastic or metal to hold the air.