Air, or some other gas, if you really want to get specific. Pure water is the least conductive substance. It is actually used as an electrical insulator by technology labs. The reason it is not widely used is that it is very expensive to produce. It is only the impurities in water that allows electricity to be conducted through it.
iron is very conductive like steel, nickel, and cobalt
no
Yes
Insulator, or insulation, or non-conductive material. Wood, plastic and ceramic are examples of non-conductive material often used as insulators.
Electricity can pass through a wide verity of material that are conductive.
No, brass is not the least conductive metal. It is a fairly good conductor of electricity, though not as conductive as metals like copper or silver.
No. Mercury is actually rather conductive, being a metal.
These are ionic compounds dissociated in water.
Yes, the higher the conductivity concentration the higher the conductivity value in the material. Some times the conductive particles are surrounded with insulating materials which cut the conductive paths between the electrodes and as a result it stops the increase in the conductivity values to a certain limit according to the structure (texture) in the material.
an electrolyte is any substance containing free ions that behaves as an electrically conductive medium.
The addition of any ionic salt (even small quantities)
Glass
Lack of any media like vacuum
the condition of poverty
Conductive substances allow the flow of electricity due to their ability to carry an electric current, whereas nonconductive substances do not allow the flow of electricity. Conductive substances typically have free-moving electrons, while nonconductive substances have tightly bound electrons that do not facilitate the movement of electric charges.
a magnet Actually named magnetite, but it is a natural magnet.
Most drinking straws are made of plastic, which is generally not electrically conductive. However, paper straws may contain additives or coatings that could potentially make them conductive. It is always a good idea to exercise caution when using any materials near electrical sources.