Salt In Ice: As soon as summer comes, the sound of bells of Kulfi vendors can be heard on the street, locality and crossroads. On hearing this, the mind of children as well as adults starts getting tempted to eat Kulfi. Kulfi seller has a big box on his contract, in which he keeps Kulfi. He also brings ice cubes with him. In between, he breaks the block of ice, mixes salt in it and puts it in the middle of the Kulfi box. If you have seen him doing this, then the question must have come in your mind that why does the Kulfi seller add salt to the ice? Let’s know the reason behind this.
the science behind it
Actually, there is science behind doing this too. Those who have knowledge of science must know about freezing point, boiling point and depression in freezing point. Mixing salt in ice is based on this principle. If you do not know about them, then we tell you.
Freezing
Freezing point is the temperature at which something changes from liquid state to solid state. Like the freezing point of water is 0 degree centigrade. As soon as the temperature reaches 0 degree centigrade, the water becomes ice. In this way the freezing point of water is 0 degree centigrade. Similarly, the freezing point of all substances is different.
Boiling Point
Boiling point is the temperature at which any liquid starts boiling. If we take the example of water, then the boiling point of water is 100 degree Celsius. That means water starts boiling at 100 degree Celsius temperature.
Depression in Freezing Point
When a non-volatile substance is added to a substance, the vapor pressure of that substance decreases. The freezing point of the substance also decreases and the boiling point increases.
understand in simple language
By adding salt to the ice, the boiling point of the ice increases and the ice does not melt quickly. Now you must have understood why the Kulfi seller adds salt to the ice. By doing this he gets double profit. Ice lasts for a long time and Kulfi also remains frozen for a long time. The interesting thing is that the Kulfi seller doesn’t even know that how much he increases the boiling point of his ice every day.
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