1. As a practical matter, most scientific Wikipedia articles such as Explosive limit are reliable. 2. The lower explosive limit is 5 % methane and the upper is 15 % methane. 3. But there is both an upper explosive limit and a lower explosive limit with most combustible vapors. 4. If there is too little methane to explode, then the atmosphere is below the Lower Explosive Limit . 5. But there is both an upper explosive limit and a lower explosive limit with most combustible vapors. 6. The interval in which an air / gas mix can burn is limited by the explosive limits of the air. 7. At levels of 1000 ppm, 10 % of the lower explosive limit , naphtha is immediately dangerous to life and health. 8. Many ignitable liquids have high vapor pressures, low flash points and a relatively wide range between their upper and lower explosive limit . 9. At a high level of the gas the Upper Explosive Limit is reached, and above that the mixture is too rich to explode. 10. The first is a possible explosion if the mixture of LPG and air is within the explosive limits and there is an ignition source.
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