Task: Explanation
Input (English): Question: Carey watched the exhaust smoke leave the pipes, and saw it disintegrate into the garage. The smoke had _____ density now. 
 Answer: lower
Output (English): If we take a certain amount of gas from one container and place it into another, larger container, the gas expandsto fill the larger container. The same mass of gas is now in a larger volume, the gas now has a lower density.