Milk is always used in the kitchen for one purpose or another. Whether it's making tea or coffee, it's incredibly useful. People often heat milk before using it. However, while heating milk, even a slight distraction can cause the boiling milk to spill out of the pot. On the other hand, if you boil water in a pot, the boiling water will evaporate, but won't bubble up like milk. Are you always perplexed about this? If so, instead of worrying, read this article completely.
Scientific reason for milk and water
What is it about milk that makes it boil and spill from the pot while heating, whereas water doesn't? Let's explore the scientific reason behind this.
1. Difference in the texture of milk and water
According to a study by the Indian government's Department of Science and Technology and the American Chemical Society (ACS), to understand why milk overflows from the container while water doesn't, it's important to first understand the difference in the composition of milk and water. Water is a pure liquid composed solely of hydrogen and oxygen. Milk, on the other hand, isn't just water; it contains approximately 13 percent fat, protein, sugar, and minerals.
2. The formation of a layer of cream on the milk as it is heated
When you heat milk, the fat and protein particles in it begin to separate. The fat and protein in milk are lighter than water, so as they heat up, they rise to the top and solidify. As the temperature rises, the fat and protein combine to form a layer of thick cream on the milk's surface.
3. Steam pressure and foam storm
As the milk heats, the water in the milk tries to rise, turning into steam, but the thick layer of cream on top prevents it from escaping. The steam constantly forming below pushes the layer of cream upward. This causes tiny bubbles to gather beneath the cream, forming foam, and the pressure begins to increase. This pressure and foam push the layer of cream upward, causing the milk to spill out of the container.
4. Why does water not spill out while boiling?
Milk spills out of the pot, but the way water boils is a little different. Water doesn't contain fat or protein, so it doesn't form a thick layer on its surface. When water boils, steam bubbles formed at the bottom are released into the air without any obstruction. No steam pressure is created within the water, and it continues to boil within the pot.
Milk boiling over isn't magic; it's primarily due to the fat and protein it contains. Water, on the other hand, lacks these two elements, allowing the steam to evaporate directly into the air. Understanding this little bit of kitchen science can not only help you prevent milk from spilling, but also prevent kitchen cleaning and wastage.
