Because it is toxic to humans if absorbed or consumed.
Explanation:
they have different mass number but same atomic number
Thermosetting polymers have different properties to thermosoftening polymers. Once moulded, they do not soften when heated and they cannot be reshaped. Vulcanised rubber is a thermoset used to make tyres. Its polymer chains are joined together by cross-links, so they cannot slide past each other easily.
Answer:
How can gas become a liquard
Explanation:
air filter