Данная презентация предназначена для сопровождения урока профессионального английского языка для специальности " Строительство и эксплуатация зданий и сооружений" по теме "Metals", содержит краткое описание видов металлов, их свойств, областей применения, способствует лучшему усвоению материала по теме металлы
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«Презентация для урока "Metals"»
Metals
Metals are a group of elements that share certain properties
They conduct heat and electricity well
which is why cooking pans and electrical wires are made of meta
They are also strong and can be shaped easily
this is why they are used to make structures such as bridges
Of the 109 elements known today,
87 are metals
They are rarely used in their pure state
they are usually mixed with other metals or nonmetals
to form combinations known as alloys
Steel
Steel is an alloy of iron and a small amount of carbon
Additional elements may also present in steel:
manganese, phosphorus, sulfur, silicon, and traces of oxygen, nitrogen and aluminum.
Modern steels are made with varying combinations of alloy metals to fulfill many purposes
Iron and steel are used widely in the construction of roads, railways, other infrastructure, appliances, and buildings
Most large modern structures, such as stadiums and skyscrapers, bridges, and airports, are supported by a steel skeleton
Aluminum
Aluminum is the most widely used non-ferrous metal
It exceeded that of any other metal except iron
Some of the many uses for aluminum metal are in
Transportation
Packaging
Construction
Street lighting poles