The term fusion is often used as shorthand for nuclear fusion, but it is also a general term describing the merging of two or more entities into a single entity. The term "heat of fusion" describes the additional heat energy that is required to convert a solid that is already at its melting point into a liquid at the same temperature.
... 45 to 64, and 10.6% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 102.8 males. For every 100 females age 18 and over, ...