Heat Transfer & Phases Intro Chapter. Is the ability to do work and cause a change. Can be transferred. –Gases and liquids are made of molecules that.

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Presentation transcript:

Heat Transfer & Phases Intro Chapter

Is the ability to do work and cause a change. Can be transferred. –Gases and liquids are made of molecules that are constantly moving (kinetic energy). The faster they are moving the more energy they have. –Solids- molecules vibrate close together and transfer energy. Energy

The energy transferred from a hotter object to a cooler one. Three ways it is transferred. Heat

Is the total energy of motion in the molecules of a substance. Gases are made of molecules that are constantly moving. The faster they are moving the more energy they have. Thermal Energy

The average amount of energy of motion in the molecules of a substance. It is a measure of how hot or cold something is. Temperature

Speed of Molecules & Temp What happens to the speed of the molecules when temperature is increased?

Speed of Molecules & Temp What happens to the speed of the molecules when temperature is increased?

Speed of Molecules & Temp What happens to the speed of the molecules when temperature is increased?

Speed of Molecules & Temp What happens to the speed of the molecules when temperature is increased?

Phase Changes When a substance changes from one state or phase to another. Solids Liquids Gases Always occur with a change in heat, which is energy.

Solids Have definite shape and volume Solid to liquid- melting Solid to gas- sublimation

Liquids Has a definite volume, and is able to take the shape of the container holding it. Liquid to solid- Freezing Liquid to gas- vaporization Boiling and Evaporation

Gases A state of matter without definite shape or volume. Phase Change- Gas to liquid- condensation.

Remaining Time:

The direct transfer of energy over long distances of empty space. Moves in waves. (Electromagnetic Waves) Can not see it, but feel it a heat (Infrared) –Sunlight –Open fire Climate Radiation

Heat transfer by direct contact of particles of matter. (Transfer by Touching) Particles bump into each other and transfer their energy heating them up. –Putting your hand on a hot stove. Conduction

Heat transfer by the circular movement of a fluid (liquids and gasses). Particles flow transferring heat energy. Caused by differences in density. Convection

Density: the amount of mass in a given volume. D=M/V Heated Fluids: –Move faster and bump into other particles. –They spread out increasing the volume. –Density decreases Cooling Fluids –Move slower –They come together decreasing the volume. –Density increases How Convection Works