Insulation

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Term Paper Title	Insulation
# of Words	614
# of Pages (250 words per page double spaced)	2.46

Insulation

Before we look at insulation we must see how thermal energy moves. There are three ways it moves. The first is by conduction. Conduction is the transfer of energy by direct contact of particles. Heat spreads through out an object till the object is the same all the way around. (Physical Science section 6.1, page 1)
This happens because all particles vibrate unless in an absolute zero situation. These more violently moving particles hit each other. Eventually these particles will vibrate at the same speed. Conduction takes place in all the states of matter. Solids conduct heat better then liquids or gases because the particles are more tightly packed. Solids, such as metals are good conductors of heat. Insulators are not good conductors of heat. (Physical Science section 6.1, page 1)
The second way thermal energy travels is through convection. This is the transfer of thermal energy through the bulk movement of matter. This only happens in liquids and gases. As a gas or liquid gets lighter it expands and thus is less dense. It then rises and you get currents. This is how there are ocean currents and air currents(Physical Science section 6.1, page 1).
The third way is by radiation. This is the transfer of thermal energy through waves. This radiant energy is given of in waves by one object and is absorbed by another and changes into thermal energy. Lighter colors reflect radiant energy while dark colors absorb it. All objects that are warmer then absolute zero emit radiant energy. (Physical Science section 6.1, page 1 and 2)
Insulation does not allow heat to travel through it easily. This is why they are not good conductors of heat. Insulation uses trapped air pockets to make it hard for heat to flow through. There are three basic types of insulation: fibrous, cellular...

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