Question R7 Q19 - NSB MS 2007

Which of the following BEST explains why when a balloon filled with air is moved from a cold room to a warm room, the balloon expands:

W) the air pressure on the outside of the balloon is now greater

X) the air molecules inside the balloon get bigger

Y) the air molecules inside the balloon move faster

Z) the room's air molecules are repelled from the outside of the balloon by electrostatic forces

Science Bowl Question