How  does  it  do?
The    refrigeration'gas cools on expansion.When you have two things that are different temperatures that touch or are near each other, the hotter surface cools and the colder surface warms up. This is a law of physics called the Second Law of Thermodynamics.

What  does  it  do?

The  refrigeration are  to keep the  food  to  be  fresher,  and  keep  the food to  be fresh longer  time.

What  does  it  look  like ? 

                                                                                                                                                                                                        Impact  of  invention.           
Over the last 150 years or so, refrigeration’s great strides offered us ways to preserve and cool food, other substances and ourselves. Refrigeration brought distant production centers and the North American population together. It tore down the barriers of climates and seasons. And while it helped to rev up industrial processes, it became an industry itself.
To look at refrigeration’s impact on consumers and industry, let us distinguish the refrigeration process from the refrigerator appliance.
Refrigeration is the process of cooling a space or substance below environmental temperature. To accomplish this, the process at first removed heat through evaporation and then later in the 1850s with vapor compression that used air and subsequently ammonia as a coolant. Refrigeration has been around since antiquity. Though its inventor, Maryland farmer Thomas Moore, first introduced the term “refrigerator” in 1803, the appliance we know today first appeared in the 20th century.

On    me
I  think  the refrigeration  are help  us a  lot ,   if  we  without   the   refrigeration   our's   food  will  no  longer   be   fresh   ,food  are  not  be  safety  for  long  time .  It's  greatfule     that   we  have   the  invention  of  refrigeration .