Conduction,+Convection,+Radiation

12/20/07 http://en.wikipedia.org/wiki/Heat_conduction Conduction is the transfer of thermal energy through matter from an object of higher temperature to an object of lower temperature. Thermal energy of an object can be transfered to another object when the objects particles make physical contact. Conduction happens to us all the time. Think about a hot summer day. You go into a car and put on your seatbelt. The buckel of the seatbelt is burnig hot. You know it is hot because when you touch the buckel you can feel the buckel's thermal energy go into your hand. This happens because the particles in your hand touch the particles of the buckel. Sence your hand's temperature is lower than the buckel's temperature the buckel's thermal passes into your hand making the buckel feel hot.

http://www.mansfieldct.org/schools/mms/staff/hand/convcondrad.htm Convection is the transfer of thermal energy through gas and water. Convection often happens in the a pot of boiling water. As thermal energy is added to the water it begins to become a gas. As this happens sections of the water that are closer to the heat source become less dence and rise to the surface. Then the water that was at the surface goes to the bottom that is closer to the heat source. That section of the water becomes less dense and rises up to the surfaces. This is called a convection current. The heating water will repeat this process until the heat source is gone or until all the water in the pot turns into a gas.

1/2/08 http://en.wikipedia.org/wiki/Radiation Radiation is the transfer of energy in the form of moving waves. During the day the sun produces rays of heat and light. These rays are waves of energy that are passing through matter and space. Their are many different types of radiation. Three different types are Alpha, Beta, and Gamma. These different types of radiation have different penetration levels. Alpha waves can't penetrate paper. Beta waves can penetrate paper but, can't penetrate aluminum. Gamma waves can pass through paper and aluminum but, not lead.

An insulator is an object that dosen't conduct energy well. Examples of an insulator are oven mits. Oven mits don't conduct energy and that is why you can garb hot objects with oven mits. Insulators can also be used to keep in heat. Styrofoam cups are insulators that can keep liquids such as coffee warm but, keep your hands from burning.

A conductor is an object that cunducts energy well. Examples of cunductors are metal rods. When it is hot metal rods feel warm because they cunduct energy into your hand fast so it makes the rod feel warm. When it is cold metal rods feel cold because the rods cunduct energy out of your hand fast making your hand feel colder.

Temperature is the measure of the average kenatic energy of an object's particles. The faster the particles move the more kenatic energy the particles have and the temperature of the object is higher.

Heat is the transfer of thermal energy form one object to another. The object with more energy transfers their enrgy to an object of lower energy.

Thermal expansion is the enlargement of an objects volume due to an increase in temperature.

1/4/08

http://www.animationfactory.com/en/search/close-up.mc?&oid=4948261&s=1&sc=1&st=42&category_id=E1&q=coffee&spage=1&hoid=f30791804a44d0a365cb863a30c12eea




 * [[image:http://static-a.arttoday.com/thw/thw14/AF/animations/food/restaurant/serving_tray_steam/4947498.gif?serving_tray_steam_lg_wm width="200" height="200" caption="This shows conduction. The hot food inside the serving tray transfers its energy to the metal of the tray. The tray then conducts this energy into the air around it. If you tuched the tray it would conduct the energy into your hand making your hand feel hot."]]



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