14.1 Temperature 1. What does temperature have to do with energy? A. Temperature is a measure of how hot or cold something is. Temperature measures the.

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Presentation transcript:

14.1 Temperature 1. What does temperature have to do with energy? A. Temperature is a measure of how hot or cold something is. Temperature measures the average KE of the particles of an object.

14.1 Temperature B. If temperature of an object is high, then the particles are moving quickly, so the particles have more energy. If temperature of an object is low, the particles are moving slowly, so the particle have less energy. http://nothingnerdy.wikispaces.com/file/view/ke_of_gas_molecules.gif/71837179/ke_of_gas_molecules.gif

14.1 Temperature C. Use a thermometer to indicate temperature. Since most substances expand when heated, the thermometer measures the effect of changes in the KE of the particles. http://ncelementaryscience.files.wordpress.com/2010/07/thermometer.gif

14.1 Temperature II. What three temperature scales are commonly used? A. Fahrenheit- measured in degrees. B. Celsius- measured in degrees- SI unit. 1C = 1.8F http://www.pbs.org/wgbh/nova/teachers/activities/images/3501_zero_scales.gif

14.1 Temperature C. Kelvin- scale used for very low temperatures. Absolute zero – KE of particles is at the minimum- O K or -273C . Kelvin scale has no degree symbol. http://www.magnet.fsu.edu/education/tutorials/magnetacademy/superconductivity101/images/superconductivity-temperature.jpg

14.1 Temperature Temperature-Scale Conversions 1. Fahrenheit temperature = (1.8 x Celsius temperature) + 32.0 TF = 1.8TC + 32.0 Convert 21 C to F: Convert 56 C to F:

14.1 Temperature 2. Celsius temperature = (Fahrenheit temperature – 32.0)  1.8 TC = (TF – 32.0)  1.8 Convert 55 F to C: Convert 95 F to C:

14.1 Temperature 3. Kelvin temperature = Celsius temperature + 273 TK = TC + 273 Convert 25 C to K: Convert 64 C to K:

14.1 Temperature III. What makes things feel hot or cold? A. When objects of different temperatures are in contact, energy is transferred from one object to the other. B. This energy is heat. http://www.eoearth.org/files/118101_118200/118123/250px-Heat_transfer.jpg

14.1 Temperature C. Heat always moves from high temperatures to a lower temperatures. D. Internal KE will be transferred as heat from the warmer object to the cooler object. http://www.eoearth.org/files/118101_118200/118115/Coin_internal_KE.jpg http://www.eoearth.org/files/118101_118200/118115/Coin_internal_KE.jpg http://www.g9toengineering.com/resources/heatflow.gif

14.1 Temperature E. This causes ice to melt in your hand or warm up your hands when holding a cup of hot chocolate. http://www.instablogsimages.com/images/2007/07/18/global-warming-tbwa_25.jpg http://www.theloghouseplantation.com/images/hot-chocolate.jpg

14.1 Temperature F. Transfer of heat is quicker when there is a larger difference in temperature, such as touching a hot stove or your tongue to a pole on a cold day! http://2.bp.blogspot.com/_SbmjaaFeB84/S7oRpgqbZBI/AAAAAAAABB0/VBsXKIWOcNA/s1600/hotstove.jpg http://www.barransclass.com/phys1090/circus/HughesM/tongue_stuck.gif

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