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12 Cards in this Set
- Front
- Back
Condensation
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changing of a gas to a liquid, molecules give up so much kinetic energy that they cannot stay in the gaseous state, the slower moving molecules stick and condense; it is a warming process
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Evaporation
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change of phase from liquid to gas that takes place at the surface of the liquid, it is a cooling process due to the lowering of the average kinetic energy of the liquid; the molecules with higher KE leave to evaporation and the lower KE molecules stay behind in the liquid
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Evaporation and Condensation Rates
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Sometimes they occur at the same rate- at equilibrium. Heat is transferred to and from the surroundings. The molecules and energy leaving the liquids surface by evaporation are counteracted by as many molecules and energy returning by condensation.
- If evaporation exceeds condensation, a liquid is cooled. - If condensation exceeds evaporation, a liquid is warmed |
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Boiling
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change of phase from liquid to gas beneath the surface of a liquid, gas forms and causes bubbles; vapor pressure builds up when it reaches the boiling point so that the bubbles may rise to the surface (below the boiling point, bubbles are crushed); boiling point depends on temperature AND pressure; boiling is a cooling process- this is why it remains at 100¢ªC instead of getting
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Freezing
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change in phase from liquid to solid, energy is leaving the liquid and molecular motion slows down; ice crystals are 6-sided
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Radiation
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direct transfer of energy from the sun in all directions
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Convection currents
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upward movement of warm air and downward movement of cool air
Convection is responsible for many weather patterns in the troposphere. Convection is upward motion of rising warm air masses, while advection is a term for the movement of all other air masses. |
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Convection
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transfer of heat by movement of a fluid (liquid or gas)
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Conduction
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heat is transferred through a solid material by direct contact of one molecule with another (faster moving molecules transfer heat to slower moving molecules)
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what conducts the best heat
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Solids conduct heat the best b/c molecules are closer together.
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what is an example of a good insulator
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Air is a good insulator, not a good conductor. Good insulation traps air. (Think about down jackets and comforters.)
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Heat
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energy transferred from a hotter object to a cooler one due to the movement of atoms and molecules (particles).
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