Dictionary of Energy



Advanced gas-cooled reactor. A type of nuclear reactor cooled by carbon dioxide gas in use in the UK.


When a system undergoes a process without any flow of heat out of the system, or into it, then the process is said to be adiabatic.

Adenosine triphosphate (ATP)

The organic substance which transfers the energy used for muscular contraction by animals. In the body of an average adult there will be about 75 g of ATP present at any instant of time, but the rate of production and…

Actinium series

The series of nuclides which forms the decay chain of the nuclide 235U down ultimately to 207Pb (i.e. from uranium to lead). The mass numbers of the actinium series are of the general form A=4n+3, where n is an integer…