The amount of condensed milk that can be obtained from 1 liter of milk depends on the concentration rate of the milk. Generally speaking, it takes about 10 liters of fresh milk to make 1 liter of condensed milk. This is because, during the process of condensing, some of the water content in the milk is removed, resulting in a thick and sweetened product. As such, 1 liter of condensed milk will contain more calcium, fat, and carbohydrates than its corresponding 1 liter of fresh milk. Additionally, condensed milk is known for its sweeter flavor compared to regular fresh milk due to the sugar added during the condensation process.