The scientific name of farting is flatulence. Basically, there are 2 groups of gases in our flatulence. The 1st one is odorless gases and the 2nd one is odor gases. Before this, lets see the composition of our daily flatulence gases.
The olfactory components of flatulence include skatole, indole, and sulfurous compounds. The non-odorous gases are mainly nitrogen (ingested), carbon dioxide (produced by aerobic microbes or ingested), and hydrogen (produced by some microbes), as well as lesser amounts of oxygen (ingested) and methane (produced by anaerobic microbes).Flatus is flammable, as both methane and hydrogen are flammable gases. The odor in flatulence comes from hydrogen sulphide (from foods in the diet) and other sulfur- or nitrogen-containing compounds including methanethiol (methyl mercaptan). Upon lighting a match the hydrogen sulphide will ignite to form water (vapor) and sulphur dioxide. Removing the hydrogen sulphide may also remove the odor, although this has been disputed.
After reading the article, i just realise that why does our fart sometimes is odor but sometimes is odorless. All of these are due to the chemical reaction in our stomach. Out of the blue, the hydrogen sulphide that release along with flatulence is the main cause of the smelly gases. Last, the most humour thing is that our farting gas may cause our buttock on fire !! This is because the "gas" contains methane and hydrogen !
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