Global Tempratures Geog 1112
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This 4 page Class Notes was uploaded by Akanksha Maity on Wednesday September 23, 2015. The Class Notes belongs to Geog 1112 at Georgia State University taught by Zaina Qureshi, Lashonda J. Williams in Fall 2015. Since its upload, it has received 92 views. For similar materials see Intro to weather and climate in Geography at Georgia State University.
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Date Created: 09/23/15
De nitions Heat The form of energy that ows from one object to the other It is partially kinetic energy and partially potential energy Temperature The average kinetic energy of individual molecules Changes in heat energy occur due to absorption orand emission of heat energy Temperature Scale Scale Melting Point Boiling Point Absolute Zero Fahrenheit 32 212 459 Celsius 0 100 273 Kelvin 273 373 0 Conversion Scale Fahrenheit to Celsius o 5 o C X Celsius to Fahrenheit F18x C32 Celsius to Kelvin K C27315 Some C to F reference values 100 C212 F 40 C 2 104 F 30 C86 F 20 C68 F 10 C50 F 0 C 32 F 40 C 40 F A change of 10 0C equals a change of 18 OF Temperaturesare measure using thermometers There are two types of thermometers Mercury has health hazards Alcohol safe Of cial weather temperatures are measured by thermistors These are thermometers kept in a covered container in a shaded area on a grassy region to get accurate readings Satellites are also used Factors in uencing weather 1 Latitude 2Altitude Elevation 3Cloud Cover 4Landwater heating difference land breeze and sea breeze LATITUDE There are great difference in the temperatures of a place depending on its location on the Earth Higher latitudes nearer the poles are always colder compared to lower latitudes near the Equator ALTITUDEELEVATION The temperature decreases as altitude increases as fewer air molecules are present to absorb the heat CLOUD COVER Clouds keep temperatures warmer at night and colder during days It also depends on the type of clouds stratus clouds or cirrus clouds LANDWATER HEATING The land heats and cools faster than water For this reason coastal regions have much moderate temperatures summer and winter temperatures do not vary too much Similarly places away from the coastal regions have huge differences in summer and winter temperatures Factors in uencing landwater heating Evaporation Transparency of water Speci c Heat Movements Ocean Current NOTE The Northern Hemisphere has more temperature differences than the Southern Hemisphere because the northern hemisphere has more landmass and the southern hemisphere has more water body THE HUMAN BODY AND AIR TEMPRATURE Average internal body temperature is 368 C 982 F Humidity the amount water vapor in the air wind speed and air temperature affect our sense of comfort apparent temperature Wind chill 1 Correlates cold and wind speed 2 Stronger wind lower wind chill index and vice versa Heat index 1 Correlates heat and humidity 2 Higher humidity higher heat index and vice versa COLD Wind increases evaporative heat loss from skin latent heat ux cooling effect Lower wind chill hazards 1 Frostbite 2 Hypothermia Hazards can happen at higher temps depending on where you livewhat you are used to HEAT Human body cools via perspiration evaporationlatent heat ux again High humidity less evaporation less cooling ability Result heat crampsexhaustionstroke hyperthermia HEAT WAVES Prolonged period of abnormally high temps Often most severe in urban areas Danger not only from high temps but also lack of cooling at night Biggest cause of weatherrelated deaths
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