Food Trivia & Facts Section: FoodReference.com

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ICE CREAM MAKER

An ice cream maker or ice cream freezer consists basically of a and with a vertical paddle, which sits inside an outer container containing the freezing agent (ice & salt) or an electric refrigeration unit.  The paddle stirs and aerates the mixture to keep it smooth and prevent ice crystals from forming as the mixture freezes.

Ice floats because it is a latice of tetrahedrally bonded molecules that contain a lot of empty space

In 1846, Nancy Johnson invented the hand-cranked ice cream freezer. Nothing more is known about her. Her design was patented in 1848 by William G. Young.