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《10-METR1300-Heat-Temp-Radiation》.ppt
Heat, Temperature and Temperature Change What Do We Want to Understand Temperature Variations Air Mass Formation Vertical Variations of Temperature Variables Temperature Heat – energy transferred between two system with different temperatures Temperature Change Mass Basic Idea Molecular motion Gas – straight line motion between collisions Solid – vibration Add More Energy (Heat) and velocity increases – i.e. higher temperature Temperature – measure of energy per molecule Heat – total energy transferred between two objects with different temperatures How Is Heat (Energy) Transferred Molecule to Molecules via collisions - more efficient with more collisions molecules are closed together CONDUCTION 2. Move Molecules with their energy from one location to another PHYSICAL TRANSPORT (Convection, Advection) How Is Heat (Energy) Transferred(cont.) 3. RADIATION – energy transfer by electromagnetic radiation (light, radio waves, etc.) - Works through a vacuum - responsible for greatest share of energy transfer in the atmosphere Energy Flow Solar Energy is the Source (Radiation) Absorbed by Atmosphere and Surface (temperature changes) Transfer to the Atmosphere (conduction, physical transfer, radiation) Evaporation and Condensation of Water (latent heat) Transfer out of the Atmosphere (Radiation) Common Sense Add heat to a system Remove heat from a system Add heat to a system with more mass Add heat to a system of the same mass but with a different type of material Units Heat – calories or joules Mass – grams or kilograms Temperature - Celsius or Fahrenheit Data More Data Generalization Temperature Change is directly proportional to Heat added (or removed) Temperature Change is inversely proportional to mass of system (same heat added) Temperature Change is different for different types of materials (same mass and heat added) Relationship Heat, Mass, Temperature Change Heat Transferred is equal to mass times temperature change H = m c DT c is p
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