Presentation on theme: "Conduction, Convection, and Radiation Add this to your table of contents. Turn to the next clean page and title it HEAT TRANSFER!"— Presentation transcript:
Conduction, Convection, and Radiation Add this to your table of contents. Turn to the next clean page and title it HEAT TRANSFER!
What is all matter made of? KINETIC - Atoms and molecules! These particles are ALWAYS moving, which means they have __________ energy.
The total kinetic energy of the particles that make up a substance is THERMAL ENERGY. The MEASURE of the kinetic energy of particles within a material is TEMPERATURE. If you are eating hot soup, the soup has a high temperature which means its particles have a greater kinetic energy.
Thermal energy is transferred in three ways… Hot objects like to pass their heat energy to other things nearby. If you touch something hot, some of its heat energy flows into you—and you might get burned. This is called conduction. 1.
Conduction is… The transfer of thermal energy between two substances that are touching or between two parts of the same substance. Conduction happens mainly in solids.
Examples of Conduction… What would happen if you placed a hot spoon in a bowl of ice cream?
The transfer of heat through a liquid or gas is called convection. 2. If you are heating water to make hot chocolate, convection occurs. The water at the bottom of the cup or pan heats up first, then rises to heat the rest of the liquid.
Convection is… The transfer of heat through a liquid or gas. Warm, light liquids or gases will rise, while cold, dense liquids or gases will sink.
Like in a hot air balloon… The heater at the bottom of the balloon creates convection currents that fill the balloon with hot air, causing it to rise.
And a Lava Lamp 2 Liquids close in density Light bulb at the bottom The heavier liquid absorbs the heat and expands (less dense!) That liquid becomes less dense and lighter, so it rises!
3. You don't have to touch something to feel its heat. If you sit some distance from a campfire, you'll be able to feel its heat energy on your cheeks even though the flames are not actually touching you. This happens because the fire passes its energy through empty space by a process called heat radiation.
Radiation is… The transfer of thermal energy through electromagnetic waves. Radiation does not require matter to transfer thermal energy. The energy travels through nothingness! Sunlight is a form of radiation that is radiated through space to our planet without the aid of fluids or solids.
CONDUCTION The transfer of thermal energy between two substances that are touching or between two parts of the same substance. Direct contact of particles Hot pan on the stovetop CONVECTION The transfer of heat through a liquid or gas. Through a fluid (liquid or gas) Lava Lamp RADIATION The transfer of thermal energy through electromagnetic waves. Through electromagnetic waves Sunlight Heat is transferred in ways 3