Heat and Radiation

Definition of Heat

Heat is a form of energy transferred from the hotter object to the colder one.

Before the 9th century, Antoine Laurent Lavoisier believed that heat was a fluid. Fluid is a matter that has the ability to flow from one substance to another.

At the time the unit of heat was expressed by calorie, or kilocalorie for a bigger quantity.

 

The Effect of Heat on Matter

The water turns hot because it receives heat. Thereby, if an object receives heat then its temperature increases. An object cannot only receive heat but also release it.

 The amount  of heat transferred by an object depends of several aspects, such as mass, materials type, and the amount of temperature changes.

 

The Relationship between Heat and Mass of the Matter

Same substances with different mass, the amount of heat which is needed to raise their temperature to te same point is different

 

The Relationship between Heat and The types of matter

For different materials with the same mass, the amount of heat which is needed to raise their temperature to the same point is different.

 

The Relationship between Heat
and temperature increase of matter

That the quantity of heat transferred to a matter is proportional to the raise of the matter’s temperature.

CONDUCTION

The heat transfer through a medium in direct physical contact without a flow of the medium’s material is called conduction.

Materials that can transfer heat fells well is called heat conductor, while  materials that prevent heat transfer is called heat isolator

 

CONVECTION

Heat moves through water and air by convection. Thus, convection or heat flow is the transfer of heat by particles motion due to density difference.

 

RADIATION

Heat transfer and still occur even without a medium. That kind of heat transfer is called radiation. The quantity of heat radiated or absorbed by a body depends on its color.

A shining and bright colored body is a bad heat adsorber or emitter. While a darker body is a good heat absorber and emitter

 

 

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