Refrigerators are usually kept at about 5°c, while room temperature is about 20°c. if you were to take an empty sealed 2 liter soda bottle at room temperature and place it in the fridge, would you expect it to contact to one fourth it's original volume? options.
(a) yes, because 5 is one fourth of 20.
(b) no, because there is no gas inside the bottle.
(c) no, because celsius is not an absolute temperature scale.