Have you ever been to the hair salon to have hair extensions attached to your hair and you were asked if you wanted a hot fusion or a cold fusion? Did it make you wonder what in the world does physics have to do with hair extensions? Have you researched hair extension terminology and you were completely unsure of the meaning behind hot fusion and cold fusion? Maybe it is the first time you are hearing these terms and the difference between the two baffles you. This post should help clarify these types of hair extensions as well as share some additional information about hair extensions in general. Hot fusion…