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Explanation:

When you put Lemon into hot liquid it usually mixes in. But since you have milk, the lemon reacts badly. The milk does not have the same chemicals in it as the lemon does. The reaction of milk with lemon is depend on temperature of the milk. If the temperature of the milk is hot,adding lemon juice to the hot milk turn it to curdle. hot milk immediately react on lemon juice. If the milk is cold then the reaction takes some time

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.