Question

What happens when we add boiling water into a plastic bottle

Answer 1

Dear student,
Plastic bottle is made of special type of polymer i.e Polyethylene terephthalate. This polymer comes into the category of thermoplastic. Such, thermoplastic nature of polymer tends to have the property to deform on heating and harden on again cooling due to presence of long chain with the absence of cross linking. This absence of cross-linking between the molecules make the bottle material to get easily effected by the heat and material become weak due to breaking of bond in the materials and deforms.
Regards