CHEM-A Balloon vs liquid Nitrogen

This is an example of the ideal gas law.. It's like four or five laws all smooshed into one. When cold, the balloon freezes and shrinks (in little words, that's what happens) then when it gets back to room temperature it starts to expand back to regular size again due the the pressure of the gas from the inside.. Basically, or it just looks cool and that's why it's on here.