Heat Ch 6.

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Presentation transcript:

Heat Ch 6

substance’s VOLUME increases when TEMPERATURE increases Thermal expansion substance’s VOLUME increases when TEMPERATURE increases

Heat Transfer of energy between objects that are at different temperatures From the higher temperature object to the lower temperature object

Thermal Equilibrium

Conduction transfer of thermal energy by direct contact – touch! Kinetic energy is transferred as particles collide Solids, particularly metals, are good heat conductors

Convection the transfer of energy by the motion of heated particles in a liquid or gas Convection currents transfer heat from warmer to cooler parts of a fluid.

Radiation energy transfer by electromagnetic waves Some radiation is absorbed and some is reflected when it strikes a material

Thermal Conductivity Rate at which a substance transfers thermal energy

Specific Heat Capacity amount of heat needed to raise the temperature of 1 kg of a material by 1 degree Celsius or Kelvin can be thought of as how well a substance resists changing its temperature Water = 4,184 J/(kg K) Iron = 450 J/(kg K)