Ans. The amount of carbon dioxide released by humans or animals seems to be equal to the amount used by the plants which make a perfect balance. As the air gets warmer its capacity to hold moisture, increases. The trade winds, westerlies, and easterlies are the permanent winds. ISO 7 Cleanroom (Class 10 000) This is one of the most common classes of cleanrooms. It is because sweat from our body does not evaporate easily. Air Pressure is the force exerted on a surface by the weight of air. Answer: Air pressure is highest at the sea level. Ans. 1) Threads per SAE J475 Class 2A ext. (i)  Which of the following gases protects us from harmful sun rays? The heel is round with a diameter of 1.5 cm. Strong winds can uproot trees and electric poles, and even snap cables. Share the sea level air pressure with students (14.7 psi) and the air pressure in your city (for example, Denver, CO, at one-mile high, is about 12.4 psi). Imp.] Air pressure is defined as the pressure exerted by the weight of air … When air molecules exert a lot of pressure on the surface of Earth, meteorologists call this a high pressure area. Do we know the real meaning of Pressure? Answer:  Stratosphere contains a layer of ozone gas. A wind is named after the direction from which it blows. Hence heat is felt more. Now hold the card in place and invert the glass over a sink and remove your hand from the card. Ricecookerstudios.com has developed an interactive activity which enables one to compare how high a basket ball bounces with different amounts of air in it. 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High pressure is associated with clear and sunny skies. 1.013 x 10 5 Pa (Pascal or N/m 2) 1 atm (atmosphere) 760 mm Hg (millimeters of mercury) 14.7 lb/in 2 (psi – pounds force per square inch) (if 1-pound weight rests on 1-square inch of surface area, the pressure is 1 psi) Winds are caused by variations in air pressure. Rainfall is very important for the survival of plants and animals. These winds blow only during a particular period of the day or year in a small area. Scientists use the term one atmosphere to describe the pressure at sea level. What is temperature? For example land and sea breeze. Manage My Favorites. On the earth, the average air pressure at sea level is 1.03 kilograms per square centimeter (kg/cm2) or 14.7 pounds per square inch (psi); this is commonly measured in bars, in which atmospheric pressure is about 1 bar. In areas where the temperature is high the air gets heated and rises. To show that air exerts pressure, take a glass and fill it with water. Meeting Class 100 standards using the low-end air change recommendation (240/hour) inside a 12’ x 12’ x 7’ (3302 mm x 3302 mm x 2134 mm) cleanroom, with 1008 cu. High speed winds are known to blow away thatched and tiled roofs in rural and semi-urban areas. Q.19 How is a wind named? Light gases such as helium and hydrogen float into space from here. True ii. It is usually at 1013 mb. Ans. How does carbon dioxide create green house effect? Positive Air Pressure Cleanrooms normally operate in an air pressure range of 0.02 in. [Imp.] You can use more than one symbol in a day, if the weather changes. From the equator, it goes on coming through slanting rays. This is due to convection, a mode of transfer of heat. Question 11. What is atmosphere?The layer of air around us is called atmosphereIt extends to many kilometers above earthWhat is atmospheric pressure?It is the air pressure exerted due to weight of air present in atmosphereExplanationWe know that layer of air … An air presure machine is used to increase or decrease the air pressure inside a basket ball and then the ball is shot at the net to score a basket. Problem 1: A girl weighing 60 Kg wearing high heel shoes stabilises herself on a single heel. It has tendency to go down. Free Presentations in PowerPoint format. The air changes per hour will vary in both rooms as described below. Answer:  Crbon dioxide creates greenhouse effect by trappeing the heat radiated from the earth. We have Provided Winds, Storms and Cyclones Class 7 Science MCQs Questions with Answers to help students understand the concept very well. Nature of horizontal air pressure – Horizontally, the distribution of air pressure is influenced by the temperature of the air at a given place. After matching terms with their definitions in this worksheet about air pressure, students will interpret diagrams and apply the formula p=F/A to calculate the amount of pressure … Use pictures on symbols to show different types of weather. The unit of pressure is Pascal (Pa). Question 12. Local winds. Anemometer Question 4. [V. If they did not wear these space suits, the counter pressure exerted by the body of the astronauts would make the blood vessels burst. Is air heavier than Water? MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. Normal pressure at sea level measures 29.9213 inches (760 mm) on barometers. The air pressure that is outside of the bag (atmospheric pressure is about 14.7 psi on the surface of the earth) is now unopposed by an equal force of air pressure inside the bag. Instrument used to measure air pressure is known as Barometer. To meet the same standard using the high-end air change recommendation (480/hour) requires 12 FFUs. (a) Troposphere       (b)        Thermosphere Exosphere: It is the uppermost layer where there is very thin air. Answer:  (i)—(c), (ii)—(a), (iii)—(b), (iv)—(b), (v)—(b). Sea level air pressure. ‘. Using this one can see how the atmospheric pressure varies with altitude. (ii) Which two gases make the bulk of the atmosphere? Seasonal winds. (v) When precipitation comes down to the earth in the liquid form, it is called is the tiny drops of water present in the air, on a surface, or in the ground. Meteorologists then use that information to predict the weather. Hence there is less heat on a point of space. But plants cannot take nitrogen directly from the air. Why is there no air pressure on the moon? These winds change their direction in different seasons. → Low pressure is associated with cloudy skies and wet weather. (vi) What is air pressure? Air Exerts Pressure. Where the temperature is high, the air gets heated up and rises, thus creating a low pressure … Also the data can be plotted in a pressure versus altitude graph. Humans or animals release carbon dioxide. Testing conditions shall be controlled: inlet air pressure- 101.5 psig (7 bar); inlet air temperature- 68 (F (20 (C); ambient temperature- 68(F (20(C). Answer:  Insolation is the incoming solar energy intercepted by the earth. (c) Mesosphere. Ans. Facts about Air Pressure 3: zones. Laminar and Turbulent Air Flow. It presents the most ideal conditions for flying aeroplanes. Factors Affecting Air Pressure: 1. Ans. [Imp.] (i) Which of the following gases protect us from the harmful sun rays? The atmosphere contains a tremendous amount of air.Air has weight so the atmosphere consisting of tremendous amount of air has enormous weight. Rigid materials such as gypsum board, exterior sheathing materials like plywood or OSB, and supported flexible barriers are typically effective air barrier systems if joints and seams are sealed. Horizonally the distribution of air pressure is influenced by the temperature of the air at a given place. The concrete and metals in these buildings and the asaphalt of roads get heated up during the day. Tick the correct answer: Goa Board Class 7 Solutions for Geography – Air ... Air pressure is the pressure exerted by the weight of the air on the surface of the Earth. True/False i. In cities, we find high rise buildings. Q.18 Name various forms of precipitation. Ans. Q.1 Give an account of the different layers of the atmosphere. If rainfall is less, there is water scarcity which sometimes causes drought like situation. Other gases like carbon dioxide, helium, ozone, orgon and hydrogen are found in lesser quantities. [Imp.] But this balance is disturbed by the burning of fuels, which add billions of tons of carbon dioxide in the atmosphere. The weight of the air acting on a unit surface area is called the atmospheric pressure. The astronauts would bleed. Question 6. Therefore, the pressure is the highest at sea level and decreases with altitude. As a result, the increased volume of carbon dioxide is affecting the earth’s weather and climate. What is an important feature of Stratosphere? Air has weight. This presentation discusses pressure, pressure in air, and pressure in water. Answer: The degree of hotness and coldness of the air is known as temperature. It is called loo. If you need an ISO 7 cleanroom, you should consider having an ISO 8 airlock/gowning room prior to entering the ISO 7 room. The upper most layer of the atmosphere is known as exosphere. Our atmosphere has five different layers. It is usually fixed on top of a building. For example the sun comes out when .rain stops. It extends between 80—400 km. It protects us from the harmful rays of the sun. Pressure is defined as the physical force exerted on an object. This layer helps in radio transmission. Since the pressure is dependent on the area over which the force is acting, the pressure can be increased and decreased without any change in the force. The weight of air presses our bodies all the time.This weight of air acting on a surface causes air pressure.Air pressure can be understood with the help of certain activities. Heavy air sinks and creates a high-pressure area. It covers up less space. Temperature and Air pressure cause expansion and shrinking of air which further results into distribution of heat and moisture in the atmosphere. It consists of several gases in which nitrogen and oxygen occupy the major portion. In areas having lower temperature, the air is cold, hence, it is heavy. The pressure exerted by air is called the air pressure, which is the thrust exerted by air per unit area. The air pressure is … (iii) Carbon dioxide creates a greenhouse effect in the atmosphere. Mesosphere: This layer extends up to a height of 80 km. Imp.] The basic formula for pressure is F/A (Force per unit area). Q.1 Give an account of the composition of the atmosphere. Air barriers are intended to resist the air pressure differences that act on them. The weight of the air acting on a unit surface area is called the atmospheric pressure. As we go up the layers of the atmosphere, the pressure falls rapidly. Q.6 Why do astronauts wear special protective suits when they go to the moon? Answer: It protects us from the harmful effect of the sunrays. Air Pressure Air exerts pressure in all directions. This is because air exerts pressure on the card  from below to keep the card in place. [V. Moisture. (c) Snow. (a) Carbon dioxide (a) Increases         (b) Decreases Cyclones or depression are used to call the low pressure zones. to 0.2 in water column (H20). Atmospheric pressure is the air pressure which is exerted by the weight of air present in the atmosphere. These blow constantly throughout the year in a particular direction. The pressure exerted by air is called the air pressure, which is the thrust exerted by air per unit area. ft. of volume, requires 6 FFUs. Resource.itschool.gov.in has created an interactive animation which shows a hot air balloon with control panel. Bacteria, that live in the soil and roots of some plants, take nitrogen from the air and change its form so that plants can use it. (a) Cloud           (b) Rain False iii. Cover the mouth of the glass with an index card. It brings fresh water to the earth’s surface. (i) Atmosphere is a thin blanket of air that surrounds the earth. What is it dependent on? Air Class 7 Notes Social Science Geography Chapter 4 SST Pdf free download is part of Class 7 Social Science Notes for Quick Revision. (vi) The pressure exerted by the weight of air on the earth’s surface is known as air pressure. I am asking this question because one of our clean room has a pressure differential of 0.02 inches water (clean room to gowning) and 0.01 inches water (gowning to outside). [V. CREATE NEW FOLDER. Thermosphere: In this layer, the temperature rises very rapidly with increasing height. The ionosphere is a part of this layer. Q.17 How is the flooding of low lying areas caused? In normal circumstance average air pressure at sea level is 1013.2 milibar. [V. Ans. What is the significance of greenhouse gas? Mention its different types. Answer: There is no air on the moon and therefore no air pressure. Q.2 How do Bacteria help plants use nitrogen? A wind blows from a region of high pressure to a region of low pressure. When air moves at high speeds, it creates a low pressure area. For example monsons in India. Answer the following questions briefly. Watch this video to know more. 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