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.
Because of density difference. High density causes the body to sink and low density makes the things to float on the surface.
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.
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.
Beryllium and Molybdenum
if it is high the density is high so if the temperature is low the density is low.
Insulate the thermos with a very low heat-conducting material. Low density objects such as ceramic or foam are typically good insulators.
Non metals do not conduct heat & electricity, good insulators, non mileable, high combustivity, low density and light in weight
good conductors of heat bad insulators low resistence high conductivity
good conductors of heat bad insulators low resistence high conductivity
Because of density difference. High density causes the body to sink and low density makes the things to float on the surface.
elements with low thermal conductivity are called insulators. they cannot transfer heat in an efficient way. they are not good conductors.
Yes, because aluminium has a low density.
because its density is low
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.
good conductors of heat bad insulators low resistence high conductivity
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.
All electrical insulators have a high resistance to current flow.