1. One winter evening, after drinking a soda, you tighten the cap back on its empty 20 ounce plastic
bottle and leave it in your car. Returning to your car the next morning, you find that the bottle
has collapsed, looking like it was crushed overnight.
In terms of heat and thermodynamics , explain what has happened to this bottle.
Solution
When the bottle was closed after emptying the liquid inside it the space inside the bottle was
occupied by the air at the evening temperature, when the bottle was kept aside throughout the
night where it experienced fall in temperature, then the pressure of air inside the bottle decreased
as ( pressure is proportional to temperature "Boyle's Law") and since the environment outside
the bottle exerted pressure on the walls of the bottle it collapsed, This phenomenon can also be
explained by Charle's Law as the temperature of bottle decreased the volume of air inside it also
decreased and hence it shrunk and the bottle collapsed.