Polymers which soften on heating and harden when cooled are?
Polymers which soften on heating and harden when cooled are?
پولیمر جو گرم ہونے پر نرم ہو جاتے ہیں اور ٹھنڈے ہونے پر سخت ہو جاتے ہیں؟
Explanation
Polymers that soften on heating and harden when cooled are called thermoplastics.