Definition: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
Input: Question: If Mona is filling balloons with helium and she starts to remove helium, what happens to the space the molecules have to move in? 
 Answer: increases
Output:
When a gas is squeezed into a smaller volume, the particles have less space to move.