industrial facilities. Reduces bloods ability to transport oxygen; headaches and fatigue‚ mental impairment or death at high levels. Chlorofluorocarbons (CFCs) Human made organic compounds containing chlorine and fluorine Attack the stratospheric ozone layer which may cause excessive exposures to UV radiation. This may increase cataracts and weaken the immune system and cause skin cancer. It may also disrupt the eco system.
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as oxygen‚ carbon dioxide‚ nitrogen and a few other gases. The problem of air pollution comes when unwanted chemicals chemicals are released into the air. Hisyam : Unwanted chemicals‚ Doctor? Can you give me an example? Dr.H : Well ozone is one example. Ozone is a poisonous gas that can cause breathing problems. It’s very bad for asthma patients. Hisyam : These unwanted chemicals in the air. I suppose you could call them pollutants. Dr.H : Yes‚ pollutants‚ because they pollute the air. Hisyam :
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* Atmosphere * Composition of atmospheric air * Note: Atmosphere A thick gaseous envelope surrounding the earth is called atmosphere. The density of air in the atmosphere varies with altitude. Atmosphere is divided into five different layers or zones: * Troposphere * Stratosphere * Mesosphere * Ionosphere * Exosphere Composition of atmospheric air Gas | Relative %age Volume | Nitrogen (N2) | 78.09 | Oxygen (O2) | 20.93 | Argon (A) | 00.93 | Carbon di oxide
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d.FOC emissions from certain trees and plants can play a large role in creating photochemical smog. e.Temperature inversions can help to disperse pollutants. 36.Which of the following statements is true? a.Temperature inversion occurs when a layer of cold air prevents warm air from rising. b.Temperature inversions exacerbate pollution problems. c.Temperature inversions last only a few minutes to a few hours. d.Normally‚ cool air near earth’s surface expands
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GENERAL SCIENCE POINTERS BASIC CONCEPTS AND LAWS Science and Technology Science - is a systematic study that is concerned with facts and principles‚ and methods that could be observed in our natural or physical and social environment. It comes from the Latin word ’scire’ that means ’to know’. - is both a body of knowledge and a process – away of thinking‚ a way of solving problems The Branches of Science THE PHYSICAL SCIENCES • Physics: The study of matter and energy
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computer and an Internet connection why don’t you access the online addition of your favorite newspaper?Also recycle paper that you already have. We need to reduce not adapt.If we keep on producing carbon this will create a big hole into the ozone
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Word History Of Sky? Other versions of why the sky is high Why the Sky is so High? Long ago‚ the sky was very low. It was so low that people could touch it if they raised their hands. At the horizon‚ where the sky nearly touched the earth‚ was a village. Here lived an old woman all by herself. All day long she was busy with her household chores. Cleaning her utensils‚ scrubbing the floor‚ and dusting her courtyard. One day‚ she saw that her courtyard was very dirty
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smoke‚ or more particularly‚ soot and ash‚ may coat plant leaves directly reducing photosynthesis by preventing light penetration or even by clogging stomatal openings. The pollutants involved in acid rain are sulphur dioxide‚ oxides of nitrogen‚ ozone and various volatile organic vapours given off from gasoline stations. Fossil fuels contain between 1% and 4% sulphur and consequently around 30 million tonnes of sulphur dioxide is emitted from the chimneys of Europe each year. It’s effect in high
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want our love ones or friends to have these illnesses right? So we must stop smoking in public areas or much more let us stop smoking right now. Other thing is that our Ozone Layer is Thinning that is why we need to stop smoking because it promotes Air Pollution which is considered as the top one destroyer of our Ozone Layer that covers us from the Harsh UV Sun Rays. It also has Nicotine wherein many people get addicted on it‚ it is also considered as a drug. Other People‚ who are using
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of the present lesson are to introduce the student to the history of refrigeration in terms of: 1. Refrigerant development (Section 2.2): i. ii. iii. Early refrigerants (Section 2.2.1) Synthetic fluorocarbon based refrigerants (Section 2.2.2) Non-ozone depleting refrigerants (Section 2.2.3) 2. Compressor development (Section 2.3): i. ii. iii. iv. v. vi. Low-speed steam engine driven compressors (Section 2.3.1) High-speed electric motor driven compressors (Section 2.3.1) Rotary vane and rolling
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