Convection

Which we call convection is actually a combination of conduction through a fixed medium and convection, while heat carried by a moving medium. for example if there is running water, say in contact with a hot surface, some liquid was heated by conduction and heat it brought along with the moving liquid. If the water is warm then come into contact with a cold surface, the water will give a portion of its heat to the surface, again through conduction.

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Isolator

Many other events that show the insulating properties of air. The house as often isolated by arrangement dual wall, air space formed between the outer wall and the plaster walls. Insulation is made more effective way by placing the material is more loose. As mineral fibers in the air space, preventing air circulation inside the dual walls it.

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Conduction

when an object attached to other objects, the temperature will rise in this place. The molecules vibrated faster even though stay in place, the molecules that transmit the vibrations to the surroundings. That's how the heat propagates through conduction.

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HEAT TRANSMISSION

The so-called thermal or heat is actually the kinetic energy, the energy motion of molecules vibrate. When an object is cold, its molecules vibrate slowly. When the temperature is increased vibration growing rapidly and the molecules have greater motion energy. Energy motion are multiplied by the heat causes solids to liquid and from liquid to gas.

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Sublimation

Sublimation is the change in states of matter from solid to gas or from gas to solid. When the temperature of the particles constituent a solid substances is increased, then the particles will sublimate into gas. Conversely, when the gas temperature is lowered, the gas will soon change its form into a solid.

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Boiling

When the liquid temperature was raised, will be reached a certain point when the liquid begins to boil. Boiling can be interpreted evaporation that occurs in the entire liquid contents, not just on the surface only. Vapor bubbles are formed inside the liquid. The bubbles will rise and break through the surface.

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Evaporation

If a liquid is heated, there will be other types of changes. at any given temperature, the liquid contains molecules that have a different amount of energy. Most of the molecules would be so strives to penetrate the surface of the liquid, but the pull of the molecules on the surface will pull back off the earlier molecule. Certain molecules that have a much higher energy will escape into the open air and move beyond the reach of the attraction of molecules on the surface. molecules that escape will form a gas or vapor. The process of change of liquid to gas is called evaporation.

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Matter - Changing States

Effect of heat can result in changes in the state of the object. This means that if an object is heated, it will change from one state to another of the three state forms of matter can be either solid, liquid, and gas.

What happens when an object changes from the solid phase to liquid phase, as if the ice become water?

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Heat - Expansion and Contraction

We have seen that most of the solids will expand when heated and shrink when cooled, when a railway station is installed, a small room should be made between the rail connection to allow the rail it expands during the summer. Rivets are used to connect parts of the steel frame building is a good example about effect cooling on the solid object. Initiated by heating the rivet nail, and then plugged in when it it's hot. When it is cool, rivets it will shrink and pull the two sections of steel tightly.

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Specific Heat

Not all the material absorbs heat at the same speed if the material have the same temperature change. For example, if water, iron, mercury, and gold in the same weight and same initial temperature,have temperature increase the same, each will absorb different amounts of heat. Unit called the specific heat is used to show the heat absorption capability. Specific heat of a substance is the amount of calories needed to raise the temperature of one gram of a substance by 1 degree centigrade.

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MEASURING HEAT INTENSITY

We have to measure the heat in order to acquire certain knowledge about heat. Our feelings cannot be use to measuring the degree heat an object because it is often mislead us.

In solid Object, the molecules attract to each other with more powerful and permanent position, so the vibration of the molecules just around a fixed point.

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HEAT PROPERTIES - NATURE OF THE HEAT

The nature heat is an energy that cannot be seen, heard, or smelled. However, the influence of this energy can be felt. In addition properties of the heat energy in general also have special properties. This suggests that the heat properties could have moved to another place. The closer the heat source, more hotter and faster it transfered. Further away from the heat source, the less heat is transfer.

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THE SUN - SOURCE OF HEAT

Heat plays a very important role in our daily lives as a heating system that keeps us warm in winter,in the summer we prefer to keep the house temperature lower by using the air conditioning system,heat engines generate power for cars, trucks, trains, diesel, certain heat engine running dynamo that generates electricity,electricity operate factory machinery, and other tools, our lives a lot depends on the heat,actually our own body is a heat engine, the food we eat is the fuel so that our bodies are still warm and provide energy for our activities

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