Is heat retention the same as heat conductivity? What materials are the greatest at retaining heat?

Question

I understand copper is a great thermal conductor. Does this also mean it holds in heat longer? What materials have the greatest heat retaining qualities?

Answer 1

Water and salt are good heat retaing materials.

I would say a large heat conductivity has to be detrimental to heat retaining capability. Think about it, a body that transmit heat easily cannot retain it. And if it cant transmit heat, it must retain it, where else would the heat go?

Answer 2

No, Heat retention is the opposite of Heat conductivity.

When heat is transmitted through a solid without the actual movement of particles, but transfer of heat from one particle to the next and so on, this phenomenon is known as Heat conductivity.

the ability of a body to retain heat is known as heat retention.

Most bodies that do not conduct electricity can also retain heat.

Some of the best materials that retain heat are PUF (Poly urethane foam),and  asbestos,

Answer 3

No, just the exact opposite.  Because it's such a good conductor, it carries heat away from itself exceedingly well.

But, in general, the materials that prevent heat from moving are not the materials that you wish to have for storing heat.  Consider a hot lunch; wouldn'y make much sense to eat stryrofoam, would it?  But, you'd use styrofoam to keep your hot lunch hot, or your cold drinks cold.

Styrofoam is a great insulator.  The best insulators today are vacuum sealed aerogels.  You can read the article in Wikipedia.  The vacuum prevents thermal conduction, while the sealant prevents radiated heat loss.