Make a list of five mads of metal glass plastic
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Answer:
Glass
Glass is one of the most versatile materials created by humans. Glass is made mostly of sand, which is made up of silicon dioxide. When sand is heated to a very high temperature (about 1700°C) it becomes a liquid. When it cools again, it undergoes a complete transformation and becomes a clear solid.
The glass we are most familiar with today is called soda-lime-silica-glass. It is made mostly of sand, but some other ingredients as well. Soda ash, which is made up of sodium carbonate, reduces the sand’s melting point. This means it doesn’t have to be heated to as high a temperature before it turns into a liquid. But soda ash also makes the glass water-soluble. This means it can dissolve in water! Limestone, or calcium carbonate, is added to stop this from happening.
When the liquid glass mixture is cooled a bit, it can be used in many different ways. It can be poured into a mould to create things like bottles or lightbulbs. It can also be “floated” to create perfectly flat sheets that will become windows or mirrors. The mixture is then allowed to cool and become solid.
The main properties of glass are:
transparency: you can see through it
heat resistance: it doesn’t melt easily
hardness: inability to break.
Plastics
Plastics come in many different forms. They are used to make a wide variety of products. Plastic molecules are made up of long chains. These molecules are called polymers.
Did you know?
The word “plastic” comes from the Greek “plastikos” which means “able to be shaped”.
Most plastics are either thermoplastics or thermoset plastics. Thermoplastics are heated and then moulded into shape. They can be reheated later and reshaped. Most plastic bottles are thermoplastic. Thermoset plastics can only be heated and shaped once. Thermoset plastics are used to make things like electrical insulation, dinner plates and automobile parts.
Plastics have many useful properties. They are:
Usually easy and low-cost to manufacture
Strong and durable
Resistant to electricity and water
Resistant to many types of chemical corrosion
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