1. GLASS Adriana Ascherová Daniela Baštová Lenka Hlochová

2. GLASS INGREDIENTS - Common glass is made from: - sand or silica (SiO 2 ) - sodium carbonate (Na 2 CO 3 ) - limestone (CaCO 3 ) - magnesium carbonate (MgCO 3 ) - additives to improve the glass quality and to colour the glass.

3. BASIC INFORMATION – glass is highly resistant to most chemicals – its big enemy is hydrofluoric acid – water can corode glass (depends on temperature) – good termal conductor – it is a common material enemy = nepřítel, conductor = vodič

4. FIRST GLASS – was made by volcanoes and and is called OBSIDIAN = shiny, usually black – obsidian was formed, when vulcanic molten lava comes into contact with water and cools quickly – obsidian is mostly from silicon dioxide molten = tekutý

5. HISTORY – – humans have used natural glass to create simple tools for a long time – – it is not well known where and when the first man-made glass was produced – – this glass was used as a glaze to decorate objects – – it was also made in ancient Egypt and was valued as much as gold – – glass making was at that time a very slow process

6. GLASSBLOWING = process of forming glass glassblower = a person who blows glass

7. INTERESTS SEA GLASS ( or beach glass) = glass found on beaches along oceans or large lakes – it originates from bottles and jars that enter the water as litter and become broken up by the waves and rocks – collecting sea glass is a hobby among beach, and many enjoy filling decorative jars or making jewelery from their finds jars = sklenice

8. INTERESTS OPALINE GLASS = a decorative style of glass made in France – can appear either white or brightly colored in shades of green, blue, pink, black, lavender and yellow – the popularity of Opaline glass began during the reign of Napoleon levander = levandulová

9. GLASS AND ENVIRONMENT GLASS RECYCLING = the process of turning waste glass into usable products – 752,000 tons of glass is now recycled annually in the United Kingdom – the use of recycled glass in new containers helps save energy – it helps in ceramic manufacture, and it conserves raw materials, reduces energy consumption, and reduces the volume of waste sent to landfill. raw = surový, energy consumption = energetická spotřeba, landfill = skládka

10. GLASS AND ENVIRONMENT GLASS COLECTION – Bottle Banks are very common near shopping centers, at civic amenity sites and in local neighborhoods. – The first Bottle Bank was introduced by Stanley Race CBE, then president of the Glass Manufacturers’ Federation and Ron England in Barnsley the second was installed in Oxford. – BB commonly stand beside collection points for other recyclable waste like paper, metals and plastics. – There are now over 50,000 bottle banks in the United Kingdom

11. Thx for your attention