1. Refrigerators Group 2

2. Who is the inventor of the refrigerators ?

3. First known artificial refrigeration was demonstrated by William Cullen at the University of Glasgow in 1748. BUT In 1805, an American inventor, Oliver Evans, designed the first refrigeration machine. 1 st practical refrigeration machine built by Jacob Perkins in 1834. An American physician, John Gorrie, built a refrigerator based on Oliver Evans design in 1884. William CullenWilliam Cullen

4. Jacob Perkins 9 July 1766 – 30 July 1849 Was an Anglo-American inventor, mechanical engineer and physicist. Born in Newburyport, Massachusetts Perkins was apprenticed to a goldsmith

5. History of the refrigerator !

6. Refrigerators from the late 1800s until 1929 used the toxic gases ammonia (NH3), methyl chloride (CH3Cl), and sulfur dioxide (SO2) as refrigerants Several fatal accidents occurred in the 1920s when methyl chloride leaked out of refrigerators

7. What does the refrigerator contain ?

8. A power failure warning, alerting the user by flashing a temperature display. The maximum temperature reached during the power failure may be displayed, along with information on whether the frozen food has defrosted or may contain harmful bacteria; Chilled water and ice available from an in-door station, so that the door need not be opened; Automatic defrosting

9. Adjustable shelves and trays which can be repositioned to suit the user; A Status Indicator to notify the user when it is time to change the water filter An in-door ice caddy, which relocates the ice- maker storage to the freezer door and saves approximately 60 litres of usable freezer space. It is also removable, and helps to prevent ice-maker clogging; A cooling zone in the refrigerator door shelves. Air from the freezer section is diverted to the refrigerator door, to cool milk or juice stored in the door shelf. Cabinet rollers that allow the refrigerator to be easily rolled around for easier cleaning;

10. Uses of the refrigerator!

11. The use of refrigerator are that it can slow down the bacteria process so you can keep your food for a longer period of time. It is to keep your water cold and preserve some food!

12. Now its time to see what is inside the refrigerator :D

15. Special thanks to …  Google/Google Images  Wikipedia  Yahoo  History.com  Ask.com  Answers.com

16. The End Done by: Awais Bennet Done by: Dylan Rachel The End