A lighter like the one shown below uses a substance called butane as its fuel. The butane can be burned to create a flame at the tip of the lighter.


a butane lighter


A teacher shows some of her students that the fuel inside the lighter's fuel tank is a liquid. But when she pushes the button that lets the fuel out of the lighter, they observe that it comes out as a gas. She and her students decide to investigate to discover what makes the butane change from a liquid to a gas.


Which step of an investigation would best help them determine what causes the change of state?

A.

calculating the volume of the lighter's fuel tank

B.

comparing lighters that use different kinds of fuel

C.

measuring the pressure inside the lighter's fuel tank

D.

heating butane gas to see if it changes state