Why are our fingers cooler than the rest of our body during winter?

For a clear understanding of the subject we will have to do an experiment with two metal cups, say, the ever silver tumblers we use in our house. Let the two be considerably different in their sizes. If the two cups are filled with water and left undisturbed, the water in the smaller one cools down faster. This is because things usually cool from the surface. The cup with grater surface per unit volume cools faster. If the bigger cup is ‘n’ times higher and broader than the smaller, then its surface is ‘n’ squared times greater and the volume is ‘n’ cubed times greater. So, for each unit of the surface in the bigger cup there are ‘n’ times more volume. Hence the bigger one coos slower.

            Now let us come to the question. Our body is like a container of heat. The amount of heat per unit volume (say, every cubic centimetre) of the body is approximately the same. But the fingers and nose have a greater surface area per cubic centimetre than other parts of the body and so they cool down faster. The body makes up for the heat loss through various biological activities. But as soon as the heat is delivered to the fingers it escapes through the surface. But the rest of the body does it slower and so are a little hotter than the fingers.