RefrigeratorRefrigerator

The mostThe most

important invention.important invention.

Before refrigerators people put their food in Before refrigerators people put their food in holes packed with snow or iceholes packed with snow or ice..

In 1748 William Cullen demonstrated In 1748 William Cullen demonstrated artificial refrigeration for the first time, at artificial refrigeration for the first time, at Glasgow university. His discovery was not Glasgow university. His discovery was not put to practical use though.put to practical use though.

Carl von Linde invented to first working Carl von Linde invented to first working refrigerator in 1876.refrigerator in 1876.

Carl von Linde Carl von Linde Full name: Carl Paul Gottfried von Linde Born: June 11, 1842 in Berndorf, Germany Died: November 16, 1934 in Munich, Germany He lived in in Germany his whole life.

Linde was a member of scientific and engineering associations, including being on the board of trustees of the German National Metrology Institute and the Bavarian Academy of Sciences and Humanities.

He invented the refrigerator and oxygen tanks.

He invented the refrigerator for the beer breweries in 1871, it allowed a fermentation of the beer at a constant temperature, that was just the starting piont.

What does the refrigerator do?What does the refrigerator do? Stores foods at low temperatures, to inhibit the Stores foods at low temperatures, to inhibit the

destructive action of bacteria, yeast, and mold. destructive action of bacteria, yeast, and mold.

Why is the refrigerator important?Why is the refrigerator important? It keeps are food cold. We want to keep our food It keeps are food cold. We want to keep our food

cold because it slows down the bacteria process cold because it slows down the bacteria process so you can keep your food for a longer period of so you can keep your food for a longer period of time. time.

Example:Example: If you kept your milk out on the counter then it If you kept your milk out on the counter then it

would get spoiled or sour in 2-3 hours. If you keep would get spoiled or sour in 2-3 hours. If you keep it in the refrigerator then it can last up to 1-2 it in the refrigerator then it can last up to 1-2 weeks at a time. weeks at a time.

The refrigerator came out The refrigerator came out with different models of with different models of refrigerators. Mini ones, refrigerators. Mini ones, one with multiple doors, one with multiple doors, built in freezers, etc. built in freezers, etc.

The first refrigerators The first refrigerators were made of stamped were made of stamped out metal parts with out metal parts with fiberglass or cork in fiberglass or cork in between the panels for between the panels for insulation, they had insulation, they had rubber door seals, all rubber door seals, all copper coils, and was copper coils, and was powered by Electric or powered by Electric or Gas. Gas.