• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Before mechanical refrigeration systems were introduced, people cooled their food with ice and snow, either found locally or b

Extracts from this document...

Introduction

Refrigeration is defined as "The process of removing heat from an enclosed space, or from a substance, to lower its pressure." (First website given in bibliography) In simpler terms, it is removing heat from states of matter in order to keep them cooler. The basic need for refrigeration is to cool food and beverages, as they often get spoilt if the temperature is high. Before actual refrigerators and other such mechanical systems were introduced, it was very common for people to cool their food with ice and snow. These materials were either gathered from the mountains, or were provided locally. For most of history, cellars were holes dug into the ground, covered with ice and lined with either wood or straw. ...read more.

Middle

The simple parts of a refrigerator include the compressor, two sets of heat exchanging pipes, an expansive valve, and the refrigerant. The refrigerant is almost always ammonia because it evaporates fast. All in all, the primary means of refrigeration is the rapid expansion of gases that are caused by cooling. The second law basically states that heat can only flow from warmer bodies to colder bodies. If not, then from a substance at a certain temperature to a temperature that is lower. This summarizes the general idea on how a refrigerator works. Economics has affected the way this device is used in several ways. A refrigerator is an essential item in almost every household today. As more are marketed, there is a demand for better quality, better efficiency, and more modern refrigerators. ...read more.

Conclusion

This may lead to food poisoning which is not only uncomfortable, but highly threatening to young children and elders with weaker immune systems. This can be controlled by keeping a regular check on perishable foods and the temperature of the fridge. CFC's are also sometimes used refrigerators as a cooling factor. This causes an environmental problem as CFC's have been known to help contribute to global warming. The ethical situation is to weigh the pros and cons of the device, for the downsides are just as important to consider. Refrigerators can link to health, social, and environment areas of interaction. A fridge makes life a bit easier for almost everyone and allows less time consumption in preparing a meal. Health wise, it prevents food from spoiling and gives it a longer life. Environmentally, it appears to be quite safe and does not require an incredibly large amount of electricity. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Food Technology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Food Technology essays

  1. Research into how people view Internet shopping.

    Consumers are continuing to abandon high streets to look for better priced products online, as more people gain access to the internet. The most popular product bought globally over the internet is books. According to research by Nielsen Online, out of the 26,312 people they surveyed, 41% of internet users had bought books online.

  2. heal and social unit 2

    He is not getting enough nutrients daily. He eats a lot of fatty food like pizza and burger. This is bad for him because he is getting too much salt, sugar, oil. Too much off these could lead to serious problem such as heart attack.

  1. Bacterial Food Poisoning

    Arthritis has been identified as an infrequent but significant sequel of this infection. Y. enterocolitica is commonly present in foods but with the exception of pork, most isolates do not cause disease. Like Listeria this organism is also one that can grow at refrigeration temperatures.

  2. SERVICE SYSTEMS

    labour costs > Capital investment in cart > Large amount of space is required for the cart to go around the table > Fewer tables in dining room. Silver Service (Russian service, or service � la russe) The food is prepared and portioned in the kitchen and placed onto silver

  1. Camera is at back of cinema Two rivalry gangs seated on either sides

    Once again in slow motion the death star moves toward the fat boy. Camera is in front of seat facing the fat boy The fat boy is eating his extra extra large popcorn mean while in slow motion the death star tears the side of the popcorn box.

  2. Research question: Do the Chinese fast food chains in Hong Kong behave in oligopoly ...

    With this apparent goal, price determination becomes exceptionally important for them. In the oligopoly structure, price determination is a strategic decision, since the firm needs not just needs to consider the cost, but also need to take its rivals' response into account.

  1. There has become an increasing demand for single portion food products - I will ...

    Examples of this are: Wedding cakes. This method would not be suitable for my product as it is very expensive and my design brief is to produce a product suitable for a supermarket, therefore more than one would be required. * Flow Production: - This is suitable to make a classic product, something that is usually

  2. People often underestimate the power of food.

    These people may feel that their lives are falling apart, that everything is out of their control-except for food. Their feeble, fragile emotional state found redemption when they realize they have the power to control their food intake. At the other extreme, some people actually suffer from a serious food addiction, stuffing their mouth constantly.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work