15. Electrical properties:
You can make the handle of the electrician scissors out
of plastic because it is an electrical insulator.
Thermal properties:
You can make the handle of the pan out of plastic
because it is a thermal insulator.
Acoustic Properties:
You can reduce the sound using mineral wool because
it is an acoustic insulator
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18. Recyclable material
Glass, paper, cardboard, some metals, some plastics
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Landfill /rubbish dump
Rubbish/garbage/trash
Bin, container
Recycling center
When we reuse and recycle we conserve natural
resources and reduce the accumulation of waste
products which damage the environment.
19. Toxic material
Heavy metals
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These materials contaminate the environment (soil, the water and the
atmosphere). They can be poisonous for living things.
20. Biodegradable material
Paper.
Organic material.
Specific plastics.
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Activity
These are materials that decompose
naturally and don't cause damage to the
environment.
24. Metals are materials with many use in the transport
and telecommunication industries, in agriculture,
in construction and in manufacturing machinery.
25. According to
Pure metals: Metals whose
crystalline structure is
composed of only one
metallic element. For
example: gold, silver, iron,
copper etc.
Metal alloys or alloys: These
are a combination of one or
two metals. One of them
has to be a metal For
example: bronze, tinplate,
steel, cast iron, brass
26. According to
Ferrous:
Iron (the pure metal), steels, alloy
steels and cast-iron.
Non-ferrous:
Ultralight: Magnesium
Light: Aluminium and titanium.
Heavy: All the other metals are
heavy.
Steel sections
27. The general properties of metals.
Toughness: The ability to support impacts without
breaking. Metals are tough.
Ductility: The ability to form wires.
Malleability: The ability to form sheets.
Hardness: Scratch resistance. Metals are relatively
hard materials.
Electrical and thermal conductivity: Metals conduct
heat and electricity well.
Metallic shine: Metals characteristically shine after
being recently cut.
Most of them are toxic, recyclable and reusable
Some of them are magnetic. (Iron, steel, cast iron)
Except mercury all metals are solid at room
temperature.
28. The process of obtaining metals
Mining
Obtaining the metals from mines.
Separation of the mineral into ore and gangue
The metal is extracted from the ore in an ironworks
through physical and chemical processes
29. Metallurgy
The technology of metals
Technique of obtaining and
producing metals from the
ores that contain them. It
studies its properties too
Siderurgy (ironworks)
(Steel and iron industry)