Thermal expansions of gases.

What do you mean by good and bad conductor? Give some examples of each. Define co-efficient of thermal expansion of solids. What is its SI unit.

In the thermal expansion of an ideal gas

Usually the thermal expansion of a liquid is greater than the thermal expansion of an equal volume of a solid'. State whether the statement is true or false.

Usually the thermal expansion of a liquid is greater than the thermal expansion of an equal volume of a gas'. State whether the statement is true or false.

Define the apparent thermal expansion of liquids.

Thermal expansion of invar is ________ than that of all other metals or alloys. [Fill in the blank]

The coefficients of thermal expansion of a solid are found to be the same when measured in different directions. Is this an amorphous or crystalline?

If co-efficient of thermal (length) expansion for iron be 12xx10^(-6)^@C^(-1) then ratio of thermal expansion to original length for 1^@C increase in temperature-