|
|
 |
Since The Beginning Of Time People Have Been Trying New Ideas For Keeping Things Like Food
Below is a free term papers summary of the paper "Since The Beginning Of Time People Have Been Trying New Ideas For Keeping Things Like Food." If you sign up, you can be reading the rest of this term papers in under two minutes. Registered users should login to view this term paper.
| Term Paper Title | Since The Beginning Of Time People Have Been Trying New Ideas For Keeping Things Like Food |
| # of Words | 979 |
| # of Pages (250 words per page double spaced) | 3.92 |
Since the beginning of time people have been trying new ideas for keeping things like food
cold. Up until the early 20th century ice was the best method for cooling perishable items, but
then we figured out a more efficient and affective way of keeping items cold. It was called the
refrigerator. Soon after the introduction of the refrigerator we developed something called
cryogenic freeing, which is freezing with very low temperatures.
Cryogenic freezing is the study mater that is colder than temperatures that occur naturally
on earth. The air in the cryogenic temperature range becomes a liquid or even a solid. The
lowest possible temperature is -459.69 degrees F, and the highest temperature in the cryogenic
range is somewhere around -100 degrees F. The most common matter in cryogenic freezing is
liquid nitrogen. Liquid nitrogen is most commonly used at temperatures from -100 degrees F to
-320 degrees F. Cryogenic freezing is mostly used in food processing plants to freeze small items
like patties, prepared meals, pizza, pasta, baked goods, appetizers, and confectioneries. Although
there are some systems that are designed to freeze large items like turkey breast, pork, and beef,
but because the cost of liquid nitrogen and the amount of liquid nitrogen it takes to freeze large
items it is not economically feasible. However for freezing small items cryogenic freezing is a
reasonable choice since a cryogenic freezing unit is two thirds less than a conventional system, but
you still have to add the cost of the nitrogen which will put you at over one and a half as much as
ac conventional unit.
Under natural conditions a substance is cooled by placing something cooler next to it. In
cryogenic freezing a substance is made cooler by a substance that is colder than anything in
nature. For this to happen work must be done to remove heat and then insulation must be
provided to maintain temperature. First you must compress the gas in a system so that it releases
all of its heat and then insulate the system so that it has to allow the gas to expand by using up the
remaining heat energy and cooling the system below the temperature of its surroundings. Now to
reach even colder temperatures you have to the second law of thermodynamics which states that
disorderly atoms within a system may be made more orderly only if outside energy is applied to
the system. This is accomplished by demagnetization. In demagnetization you apply a strong
magnetic field to
This is not the end of the termpaper! Register below to see the complete version of this term paper.
| Membership Plans |
Credit Card |
Check |
 |
| 1 month membership |
|
3 month membership
(You Save 50%) |
|
6 month membership
(You Save 67%) |
|
|
