What is Refrigerator?
[[File:Koelkast open.jpg|right|thumb|upright|A refrigerator with its door open]] A '''refrigerator''' is a machine used for keeping things cold. It is sometimes called a '''fridge''' or an '''icebox'''. Refrigerators were invented by Jacob Shrewsbury. It is normally maintained at 4-5 degree Celsius for household use. People put [[food]] and [[drink]]s in it, to keep those items [[cold]] or good ([[Food preservation|unspoiled]]) for a longer time. A refrigerator has a [[heat pump]] which takes heat away from the [[air]] inside the fridge. The heat is moved to the air outside. The heat pump is usually driven by an [[electric motor]]. [[File:Thinktank Birmingham - object 1978S03348(1).jpg|thumb|upright|left|Early electric refrigerator. The heat exchanger is on top. It is in Thinktank, [[Birmingham]] Science Museum.]] There are also ice boxes available that do not use electricity because they are filled with ice to provide the colder temperature. The ice can keep things cold until the ice melts. Ice boxes can be taken on [[camping]] trips. Sometimes they are called coolers. Refrigerator-sized iceboxes were used before electricity was available. Most modern refrigerators are available in a variety of [[colour]]s, although most are white. Refrigerators also come in various styles with a wide range of door styles and compressor locations<ref>{{Cite web|title=How to Choose a Commercial Refrigerator or Commercial Freezer Compressor|url=https://restaurantandmore.com/blog/post/how-to-choose-a-commercial-refrigerator-or-commercial-freezer-compressor|access-date=2025-03-13|website=restaurantandmore.com|language=en}}</ref>. Smaller versions of the popular refrigerator are also used. They are mainly used in [[hotel]]s and [[college]] dorm rooms. ==Freezer== [[File:Ice Maker (5881247006).jpg|thumb|right|A domestic refrigerator with an opened freezer compartment at the top and an opened refrigerator compartment at the bottom]] A '''freezer''' is a special type of refrigerator that stores food at freezing temperatures. Insid