How is conduction of heat different from convection of heat?

In the process of convection, heat travels :

Air is bad conductor of heat or partly conducts heat, still vacuum is to be placed between the walls of the thermos flask because

State the direction of heat transfer by way of convection.

What is heat transfer ? Explain conduction of heat.

The ratio of the areas of cross section of two rods of different materials is 1:2 and the ratio of ther themal conductivities of their mateirals is 4: 3. On keeping equal temperature difference between the ends of theserods, the rate of conduction of heat are equal. The ratio of the lengths of the rods is

Assertion : Good conductors of electricity are also good conductors of heat due to large number of free electrons. Reason : It is easy to conduct heat from free electrons.

The element of an electric heater is in the form of a coil. Once it is heated by dc volatage and then by ac voltage of equal potential difference. Will the production of heat in both cases be same of different?

What is the physical signficance of the difference of two principal specific heat of a gas?

Liquids and gases get heated by convection. Explain the convection on the basis of kinetic model.

Distinguish between Conduction and convections