1. If there is not sufficient oxygen present a fuel is not completely burned and carcinogenic 'sooty' carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater and the very toxic gas carbon carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater may be formed.

2. Fuels like carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater are very useful but must be carefully stored because they are so carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater.

3a. As we have seen, there are carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater problems with using carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater fuels.
3b. The gas carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater is in some ways an ideal fuel because it burns very cleanly to form only one product, carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater!
3c. However, it is a very carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater gas and would have to be stored under carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater in cylinders.

4a. There are other chemical carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater of energy, but they are usually carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater due to the cost of chemicals.
4b. For example a simple carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater can be made from two different metals dipped into an carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater conducting salt solution.
4c. The greater the difference in carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater, the bigger the carboncellelectricallyexpensiveexplosiveflammablefossilhydrogenmonoxidepetrolpollutionpressurereactivitysourcesvoltagewater produced.