If one employs the four basic aspects of the science energy concept(transfer, transformation, conservation and degradation) presented above to analyze the energy concept in daily life there are some striking dissimilarities. Most importantly, there is no conservation idea in a daily life context as there are present in science, but some key facets of energy degradation appear to be contained. This becomes apparent, for instance, if it is said that energy is used up in processes. But there is also a major difference between the energy degradation idea in science and in the daily life contexts. Whereas in science, energy degradation is closely affiliated with energy conservation, this is not the case for an everyday life context, simply because no conservation idea is present. It is thus not surprising that the research findings may be summarized that the daily life energy concept is nearer to degradation than to conservation(Duit, 1983). Ogborn (1986) has convincingly argued that the energy concept of daily life is quite close to the science concept of exergy. Exergy roughly outlined is the maximum energy that may be gained from processes in which a system interacts with its suroundings. Exergy, therefore, is the amount of useful energy in a systern. Exergy in some way integrates the science concepts of energy and entropy, ie.. it is the energy gain from a system that is allowed by the second law of thermodynamics. Many uses of the word energy in daily life context become mainly'right' if energy in the sentences referred to is replaced by exergy. This point of view has important consequences for drawing conclusions on how to introduce the energy concept in school science, as will be discussed below.