TemperatureThermal EnergyHeat A measure of the average kinetic energy of the particles in a substance Degrees Fahrenheit, degrees Celsius, or Kelvins Does.

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Presentation transcript:

TemperatureThermal EnergyHeat A measure of the average kinetic energy of the particles in a substance Degrees Fahrenheit, degrees Celsius, or Kelvins Does NOT vary with mass The total internal energy of molecules The transfer of energy between objects that are at different temperatures Joules Varies with mass and temp. Varies with mass, specific heat capacity, and temp. change Thermal Equilibrium is achieved when all substance have reached the same temperature. There is no more thermal energy transfer.

ConductionConvectionRadiation Thermal Energy transfers by direct contact of particles. Solids & solids or solids & liquids Thermal Energy transfers by motion of a fluid in the form of currents. Thermal Energy transfers by Electromagnetic Waves. Example: hot air rising on a sunny beach and the cool air coming in from the sea Fluids: Liquid or Gas Conduc, Convec, & Radiation Review Examples: holding a hot cup Cocoa or walking on hot sand. No matter required Examples: the Sun as you layout on the beach.

The amount of heat required to change the temp of a unit mass of a substance by 1 degree Celsius; or, the ability of a substance to hold on to heat Specific Heat Substance Specific Heat [J/(kgC)] Water4,184 Wood1,760 Carbon (graphite)710 Glass664 Iron450  Higher Specific Heat the harder to warm-up/cool down. Takes longer to expands or contract. Better Insulators.  Lower Specific Heat the easier to warm-up/cool down. Less time to expands or contract. Better Conductors. Water is a good coolant because is has a high Specific Heat.

Remember Density The hotter something gets the further the particles move from each other. It Expands and becomes less dense. The cooler something gets the closer the particles move to each other. It contracts and becomes more dense.

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