What pressure must be applied to a sample of Freon gas having a volume of 325 L to permit the expansion of the gas to a volume of 975 L?

this is poiselle's equation from fluid mechanic in physics. mech eng

i don't understand. explain it clearly

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

answerscientific theory;