FOOD PRESERVATION Food is preserved to prevent natural and microbial decay‚ by modifying the conditions that favour enzyme activity and the growth of micro-organisms. Foods are preserved for the following reasons: 1. To add variety to the diet‚ by making food available out of season. 2. To make use of food when it is cheap and plentiful and to store it for later use. 3. To vary the diet by preserving food in ways the make a new product out of the food (e.g. pickling‚ jam making).
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Electromagnetic waves in space See the book “Optics” by Hecht sections 3.2 and 3.3 Speed of light: EM waves travel in a vacuum with speed c = c = 299‚792‚458 ms-1 exactly They are transverse waves with (vector) E and B field orthogonal to each other‚ for this section bold indicates vector quanties. When far from the source (many wavelengths) the E and B fields are in phase The vector E x B points in the direction of motion Travelling waves can be written as E = E 0 ⋅ ei ( kx −ωt ) and B = B 0 ⋅ ei
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equations.[1] More fundamentally‚ n is defined as the factor by which the wavelength and the velocity of the radiation are reduced with respect to their vacuum values: The speed of light in a medium is v = c/n‚ where c is the speed in vacuum.[1] Similarly‚ for a given vacuum wavelength λ0‚ the wavelength in the medium is λ=λ0/n. This implies that vacuum has a refractive index of 1. Historically other reference media (e.g.‚ air at a standardized pressure and temperature) have been common. Refractive
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* Bernoulli’s Principle * Vacuum- A space entirely devoid of matter. * Vacuums don’t exist in the Earth’s atmosphere as air molecules are constantly bouncing off each-other. If a vacuum ever existed in the atmosphere it would be filled very quickly because there would be no resistance against the excited air molecules. * This phenomenon is the driving principle behind airplane wings. As wind blows over the wing (see picture below) there is a pressure differential between the
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upholstery care guide upholstery care guide ACTIMA - RCS Nanterre B 400 009 981 all about leather YOU’VE JUST PURCHASED A ROCHE BOBOIS SOFA: You’ve been captivated by its sleek design and color; now you’re ready to discover the secrets beneath its elegant surface: how it was built‚ and how to preserve its fine quality. This manual will guide you through the care and maintenance of your ROCHE B OB OIS Sofa. THE ➀ ROCHE BOBOIS BEGINS AT THE TANNERY. BEAUTY‚ ALLURE‚ AND SUPPLENESS
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By: Arjun Bhandari Ways of preserving half drunk wine As a wine importer‚ educator and wine writer‚ I get asked time and again- “how long can I keep undrunk bottle of wine once it is opened?” and “what is best method for preserving half drunk wine?” Each and every time I have answered the questions to questionnaires‚ today I felt like writing about the ways of preserving half drunk wine that can remain fresh and drinkable for several days after opening the bottle. We often completely drink
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Improving fruit and vegetable packaging Share Email 0 Comment(s) Print Published 2006-08-28 00:00:00 FRUITS and vegetables are an important sub-sector in the agricultural sector because they are valued as protective food. They are very rich source of minerals‚ vitamins providing more energy per unit weight than cereals. Pakistan has a wide range of agro-climatic condition‚ which allows the production of a variety of fruits and vegetables. However‚ there is a wide gap between availability
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grade class to prove that they have misconceptions about sound waves. They based their experiments on these common misconceptions held by elementary students: “sound can only travel through air not through solids or liquids‚ sound can travel thought a vacuum such as space‚ sound can be made using no material‚ and hitting something harder changes its pitch or sound”. They hoped to prove to the students their misconceptions were wrong. They observe the students misconceptions through interactive
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operative delivery is performed if a spontaneous birth is judged to pose a greater risk to mother or child than an assisted one. Operations are divided into abdominal methods (caesarean section) and vaginal assisted deliveries (forceps delivery and vacuum extraction). Preparations for operative delivery: * Discuss operative delivery with the woman and her partner (if time is short‚ at least outline what will happen) * Follow the woman’s wishes—no operative delivery can proceed without her
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normal atmospheric conditions‚ and in a vacuum chamber. Our tests showed that while everyday experience may indicate that not all objects fall toward the earth at the same rate‚ they are submitted to the same force of gravity. Materials: Feather Coin Stopwatch Meter stick Vacuum chamber Vacuum pump Magnet The vacuum chamber must have some special mechanism so that the fall of any object placed inside of it can be controlled and measured. Our vacuum chamber had an internal trapdoor that
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