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A good insulator is a substance that does not allow energy to flow very quickly when there is a temperature difference between two areas. The most important component of good insulators is stationary air because air is a poor conductor of heat. Good insulators contain millions of tiny air spaces, which slow heat conduction through them. Thus, the heat is "kept in" or "kept out". Insulators with a lower density means there is space between the particles/molecules of the material. Having the right density is critical in whether a material makes a good insulator or not. If there is not enough density, air will flow too quickly through the material; if the density is too high no air will be trapped in the material and cool air will flow quickly to the other side.
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Why do some things float and som things sinks?
Because of density difference. High density causes the body to sink and low density makes the things to float on the surface.
Are gases thermal insulators?
Yes. Gases have low thermal conductivity, so if you keep convection low (bulk movement of the gas) they are good thermal insulators. Refractive bricks used in kilns (high temperature ovens) made of silica and some other low conductivity materials are made intentionally porous.
Why is air a good insulator?
Yes air is a poor conductor but a good convector. As far as electricity is concerned, without ions air becomes an insulator. As far as heat is concerned due to lose package of molecules conduction is very poor as conduction is mainly due to vibration of bond molecules.
What materials are low density and strong and good conductors of heat?
Beryllium and Molybdenum
How do changes in temperature of air affect its density?
if it is high the density is high so if the temperature is low the density is low.
How do you make a thermos without a vacuum that prevents heat?
Insulate the thermos with a very low heat-conducting material. Low density objects such as ceramic or foam are typically good insulators.
What are physical properties of non metals?
Non metals do not conduct heat & electricity, good insulators, non mileable, high combustivity, low density and light in weight
What are the properties of electricity?
good conductors of heat bad insulators low resistence high conductivity
What are the electrical properties?
good conductors of heat bad insulators low resistence high conductivity
Why do some things float and som things sinks?
Because of density difference. High density causes the body to sink and low density makes the things to float on the surface.
Which is not a good conductor of heat?
elements with low thermal conductivity are called insulators. they cannot transfer heat in an efficient way. they are not good conductors.
Can aluminum make things lighter?
Yes, because aluminium has a low density.
Why do denser things go down ramps faster?
because its density is low
Are gases thermal insulators?
Yes. Gases have low thermal conductivity, so if you keep convection low (bulk movement of the gas) they are good thermal insulators. Refractive bricks used in kilns (high temperature ovens) made of silica and some other low conductivity materials are made intentionally porous.
What are the electrical properties of metal?
good conductors of heat bad insulators low resistence high conductivity
Why is air a good insulator?
Yes air is a poor conductor but a good convector. As far as electricity is concerned, without ions air becomes an insulator. As far as heat is concerned due to lose package of molecules conduction is very poor as conduction is mainly due to vibration of bond molecules.
What do all electrical insulators have in common?
All electrical insulators have a high resistance to current flow.
