When a substance burns it is known as combustion. For combustion to occur oxygen must be present. Once a flame has used all of its oxygen supply it will die, this marks the end of combustion. Combustion stops occurring when the flame supplying the energy to a system goes out or the substance is completely used up. In a closed system in which combustion occurs, all of the oxygen within that system is used. When this occurs the air pressure outside of the glass is greater than the air pressure within the glass because the oxygen has been used up. Even th

Some common words found in the essay are:
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Approximate Word count = 497
Approximate Pages = 2 (250 words per page double spaced)