Heat is the transfer of energy from an object of higher temperature to an object of lower temperature. A substance that heats up quickly takes very little heat to undergo a temperature change and therefore has a low specific heat. If the desert sand heats up quickly and cools down quickly it must have a low specific heat. A conductor of heat is a material which allows heat to pass through it quickly. It takes very little heat to change its temperature and therefore has a low specific heat capacity.
Insulators have high specific heat capacities.
As air rises, its pressure decreases. Its volume increases as it expands. A can of beverage will cool faster in the freezer compartment than in the refrigerator compartment since the rate of cooling is proportional to the temperature difference of the two objects. Heat transfer between your hand and the air is very slow. However, the metal insides of an oven are good conductors of heat.