MINUS 18 degrees is the freezing point of water. According to the query Taobao, the main reason for ice cream melting is temperature, and-18 degrees is the freezing point of water, so ice cream rarely melts at-18 degrees. Ice cream is a volume-expanding frozen food made of drinking water, milk, milk powder, cream (or vegetable oil) and sugar as main raw materials, and adding a proper amount of food additives through mixing, sterilization, homogenization, aging, freezing and hardening.