ATHE GNEENIS________ a system that converts heat or thermal energy to mechanical energy, which can then be used to do mechanical work. It does this by bringing a working substance from a higher state temperature to a lower state temperature.

ATIRGERORSEFR_____________ Cold temperatures help food stay fresh longer. The basic idea behind is to slow down the activity of bacteria (which all food contains) so that it takes longer for the bacteria to spoil the food.​