3º ESO Plásticos 2 propiedades

3º ESO Plásticos 2 propiedades

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00:00
hi guys today's video is about properties of plastics the first one physically they are resistant to stretching tension do you remember bending they are resistant to bending they are resistant to twisting torsion the resistant to torsion and compression so they are
00:31
mechanically resistant they are also good electrical insulators so we use plastic in cables to isolate the cables they are at the same time good thermal insulators so as you can see the handle of a pan is made of plastic so the
01:01
handle doesn't hit your hand while cooking and they are good acoustic insulators so it's very common to use some types of plastic to isolate walls for example ductile the plastics are ductile because they can be pulled to
01:33
make threats so by pulling we can obtain threats of plastic malleable plastic are usually malleable because because they can be pressed into thin sheets so by compression we can obtain thin sheets of plastic light
02:08
we can consider plastic as a light material lighter than metal and wood for example with a typical density of about 0.9 to 1.3 grams per cubic centimeter depending on the type of plastic plastics are impermeable to gas and liquids so plastics are typically used
02:45
to make bottles for example containing liquids embracing cable in three different ways for example chemical recycling which breaks plastic into its chemical components so at the end we have the initial plastic mechanical recycling that breaks plastic into small pieces as
03:22
you can see that can be melted and made into tiny pellets finally recovery energy recovery it's another way of recycling that consists on burning plastic to produce heat in centrioles or producing electricity or energy for other industrial processes this is a
03:55
type of recycling that have a disadvantage because it produces fumes in finally depending on their composition as there are a lot of different types of plastics third-team plastic may be more rigid another can be more flexible and others can be in your elastic and this is all for today thank you very much for your
04:32
attention and see you tomorrow in class

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