Final answer:
Extra hot temperature milk used in UHT pasteurization is considered extremely hot, reaching temperatures of 138 °C for at least 2 seconds to sterilize the milk for long-term storage without refrigeration.
Step-by-step explanation:
Extra hot temperature milk, as referred to in the UHT pasteurization process, would be classified as extremely hot. UHT, or ultra-high-temperature pasteurization, involves heating milk to a temperature of 138 °C for at least 2 seconds. This process effectively sterilizes the milk, allowing it to be sealed in airtight containers and stored for long periods without refrigeration. Given that the boiling point of water is 100 °C, a temperature of 138 °C is significantly higher, hence why UHT milk is considered to be extremely hot during the pasteurization process. It's important to note that this level of heat is well beyond a safe or comfortable temperature for direct consumption or contact without causing burns; it is specifically for the industrial processing of milk.