When salt and a ice cube is pressed together on human skin, why does it burn?

Is you put some salt on the top of an ice cube an press your finger against it, it'll feel like its burning.





Why is this?

When salt and a ice cube is pressed together on human skin, why does it burn?
This is a phenomenon, is commonly known as depression of freezing point, which is one of the four colligative properties. The combination of salt and ice is known as a freezing mixture, and the actual temperature of ice, which is zero degree celsius is decreased further down to -23 degree celsius. Our body has a uniform temperature of around 37 degree celsius. Thus, when such a contact is made, there is rapid exchange of heat between the skin and ice. Moreover, such sudden change in conditions also cause the damage to the epithelial layer of the skin in the finger tips, which in comparison to the normal skin is a bit more softer and sensitive, causing the burning sensation.
Reply:solidified H2O and NaCl,, hmmm.. maybe there's a reaction between them.
Reply:Zero degrees F is defined as the temperature of a mix of ice, water and salt. You are placing such a mix on you finger and it feels like 0F, as expected. Cold temperatures 'burn' because of the flow of heat (from your finger).
Reply:The salt mixed with pure water lowers it's freezing/melting temperature. This means that the ice melts despite being maintained below 0 degrees Celsius. The reason this feels colder is that this extra cold water can flow into all the micro fine crevices in your skin, giving a greater surface area of contact than with solid ice alone. This allows a greater heat flow out through your skin, causing a more rapid cooling. The increased cooling can cause greater damage to your skin cells (ice crystals can form inside the cells), this is what causes the burning sensation.
Reply:SOme scintific ****