Final answer:
It is true that separating cleaning brushes for items like ice cream machines reduces cross-contamination, ensuring food safety. The specific heat of ice is different than air, but this property is marginally relevant to the ice cream freezing process itself.
Step-by-step explanation:
To reduce the risk of cross-contamination, it is true that the ice cream machine should have its own, separate brushes for cleaning. This is a standard health and safety measure in food preparation that helps to prevent the spread of bacteria and allergens between different pieces of equipment. By using separate brushes, the risk of contamination from one batch to another is minimized, ensuring that the ice cream remains safe to consume.
Regarding the properties of ice, it's essential to note a misunderstanding in the provided information. Ice essentially has a different specific heat compared to the surrounding air in a freezer. Specific heat is the amount of energy required to raise the temperature of one gram of a substance by one degree Celsius. The specific heat of ice is lower than that of the air. However, when applying this concept to an ice-cream mixture, the specific heat difference isn't directly related to the energy absorption from the mixture. The freezing process and the efficiency of the ice cream machine in extracting heat from the mixture are more pertinent to the topic at hand.