What is metal?• Metals are one of the most important elements that we use in our every day lives, but what we need to understand why it is important. And to ﬁnd out why, we need to ﬁrst understand the Physical Properties of metals.
The Physical properties of metal Metals have varying degrees of hardness.• Metals conduct electricity and heat.• Metals are usually shiny. They have luster.• Metals have relatively high melting points and remain in the liquid state over a wide temperature range.• They are malleable LUSTER - The quality of shining by reflecting light MALLEABLE - It can be bent or shaped
Types of metal• Aluminium These are just the most popular metals• Chromium so there are lots more• Cobalt than this!• Copper• Gold• iron• Lead• Magnesium• Maganese• Mercury• Nickel• Platinum• Silver• Tin• Titanium• Tungsten• Zinc
Metal Alloys What are metal alloys? Metal alloys are a mixture of metals(and sometimes non-metals); a metallic compound. People do this to create new metals with superior quality Here are some metal alloys:• Duralumin - copper and aluminium• Woods metal - lead, tin and cadmium• Bronze - copper and tin• Brass - copper and zinc• Rose gold - copper and gold• Solder - lead and tin• Steel - iron and carbon, often other metals as well
Boiling point and melting point• Most metals melt at about 1300 °C or 2400 °F. They boil at around 3000 °C or 5400 °F - metals can withstand heat for a long time!
Conductor or insulator?• All metals are conductors which means electricity can pass through them easily.• This is why plug sockets and wires have metal in the middle of them - copper is a common metal used inside wiring because it has very good conductivity. Also, wires used as ﬁlaments in light bulbs are made from tungsten.
Hot hot hot!!!• Metal pots are made from a small range of metals because pots and pans need to conduct heat well, but also they shouldn’t react with chemicals so that they don’t change the ﬂavour of the food. Most materials that are conductive enough to heat evenly are too reactive to use in food preparation. Aluminum is a good conductor of heat and is often used to make cooking pots
Money!Lots of different coin money are used in lots ofdifferent countries they are made of metalbecause:1. Metals are valuable. Typically coins of highervalue are made of metal of higher value.2. Metals are durable. Unlike stone, they wontshatter; unlike wood, they dont burn easily andare hard to break.3. Metals are easy and cheap to form and stamp.They can be melted and recast; they can bestamped with the kings (or queens) head andanything else you want to put on them. In thisway, it becomes easier to tell real currency fromcounterfeit.
Recycling metal Did you know that you can recycle metal? - this is how it’s recycled: Scrap metal is entered into a blast furnace that burns at extremely high temperatures. The exact temperature of the furnace varies depending on the metal that is beingrecycled. The blast furnace melts the scrap metal into its molten (liquid) state and also helps to burn off any impurities. After the metal is liqueﬁed, it can then be poured into moulds for use in new products.
A Few Facts• Alkali metals such as sodium and potassium are extremely reactive elements, just putting them in water can result in an explosion! They are carefully stored in oil to prevent this happening.• Tungsten has a very high melting point, after carbon it has the second highest melting point of all elements • At room temperature, mercury is the only metal that is in liquid form.
We hope you enjoyed our presentation!By Jess Cooke & Grace Kieran