0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How are thermal insulator used to control the transfer of thermal energy?
Manufactures usually make building insulation from a fluffy material, such as fiberglass,that contains pockets of trapped air.
Is air a bad conductor of heat?
Yes and no. There are much better heat conductors, and air has a very low thermal capacity and truly minimal conduction, but air is free (at least so far), air is light, and you can blow it fairly easily. Water is a far better thermal conductor, but it is much heavier, harder to pump, and even tiny leaks cause a big mess. If you need a closed system (such as because water is limited -- no handy river!) you end up having to get the heat from the water to the air in the end. Lots and lots of electronics use air as their coolant, look around you.
Why is foam a bad conductor of heat?
Foam is a poor conductor of heat due to its unique structure and composition. There are several reasons why foam exhibits low thermal conductivity: 1. Air Pockets: Foam typically consists of a matrix of solid material with numerous air pockets or voids dispersed throughout. Air is an excellent insulator and has low thermal conductivity compared to solids. The presence of these air pockets within the foam structure creates barriers to heat transfer, reducing the overall conductivity of the material. 2. Low Density: Foam materials are often lightweight and have low density. The low density results in fewer solid particles per unit volume, leaving more space for air pockets. This further enhances the insulating properties of the foam by increasing the amount of trapped air within the material. 3. Closed Cell Structure: Some types of foam have a closed-cell structure, where the air pockets are sealed off from each other by thin walls or membranes. This closed-cell arrangement prevents the movement of air within the foam, minimizing convective heat transfer and improving thermal insulation. 4. High Porosity: Foam materials typically have high porosity, meaning they contain a large number of interconnected voids or pores. These pores act as thermal barriers, impeding the flow of heat through the material by providing pathways for air to become trapped and reducing the contact between solid particles. 5. Low Thermal Conductivity of Material: In addition to the air pockets, the material composition of foam itself often has inherently low thermal conductivity. Materials commonly used in foam production, such as polystyrene, polyurethane, or cellulose, have relatively low thermal conductivity compared to metals or dense solids. Overall, the combination of air pockets, low density, closed-cell structure, high porosity, and low thermal conductivity of the material itself makes foam an effective insulator and a poor conductor of heat. This property makes foam suitable for a wide range of applications where thermal insulation is desired, such as in building construction, packaging, refrigeration, and thermal insulation materials.
Is sponge a good heat insulator?
it is good heat insulator, as it has air in it. as air is a good insulator of heat, the sponge, which has lots of pockets of air also becomes a good insulator
How does cork stop the transfer of thermal energy?
Cork is made from the bark of a tree. Bark is not a good conductor. Cork also has countless pockets of dead air. Dead air space is also a poor conductor.
Do thermal conductors have lots of air pockets?
yup
How is cotton a thermal insulator?
Lots of air pockets among the threads.
What are the insulating qualities of snow?
very good, because there are lots of air pockets
What kinds of materials make good insulators?
There are a number of materials that make good thermal insulators. Blankets and pockets of air make good thermal insulators for example.
How are thermal insulators used to control the transfer of thermal energy?
Manufactures usually make building insulation from a fluffy material, such as fiberglass,that contains pockets of trapped air.
How are thermal insulator used to control the transfer of thermal energy?
Manufactures usually make building insulation from a fluffy material, such as fiberglass,that contains pockets of trapped air.
What does thermal conductors mean?
A thermal conductor allows heat to readily flow through itself. An example of a material with a low thermal conductivity would be air, and an example of a material with a high thermal conductivity would be steel.
Thermal insulators have?
are often metals.have high conductivity
Why does a rock with lots of tiny holes float?
because the air pockets hold enough air to cancel out the weight because water is heavier than air
Is air a bad conductor of heat?
Yes and no. There are much better heat conductors, and air has a very low thermal capacity and truly minimal conduction, but air is free (at least so far), air is light, and you can blow it fairly easily. Water is a far better thermal conductor, but it is much heavier, harder to pump, and even tiny leaks cause a big mess. If you need a closed system (such as because water is limited -- no handy river!) you end up having to get the heat from the water to the air in the end. Lots and lots of electronics use air as their coolant, look around you.
Is a sponge a good insulation?
it is good heat insulator, as it has air in it. as air is a good insulator of heat, the sponge, which has lots of pockets of air also becomes a good insulator
What material is the worst conductor of heat?
the worst conductors of heat are wood, plastic, rubber, and cloth.
