​Does a Winter Coat Warm You?

If I tell you that your winter coat does not warm you, you will not believe me. But you can make an experiment. Look at the thermometer and see what the temperature is. Then wrap it in your winter coat and put it on the table. Some hours later look at the thermometer again. The temperature will not change. So your winter coat does not warm you.

But does it cool you then? Take two bags of ice and wrap one in your winter coat. Leave the other on the table. When this second bag of ice melts, unwrap the coat. The ice in the first bag has not melted. The coat has not warmed it, it even seems that it cooled it.

So, does a winter coat warm you? No, it does not. It helps us to warm ourselves, and we ourselves warm the coat.