Transparent plastic cups are disposable and have thin walls. They are available in vending machines and are primarily used for cold drinks. Are there reasons why this type of cups are not used for hot drinks, like coffee or tea?
Structure and properties of polymers, recycling
Can be done at age 15-16 without going into glass transition temperatures and structures; age 17-18 with a more detailed look at polymer structure and properties.
Expected time for the mystery
Disclaimer: The authors of this teaching material shall not be held responsible for any injury or damage to persons or properties that might occur in their use.