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2026. 6. 30. 작업
난이도 & 준비물
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Why is gas around a car battery only at risk of ignition from jumper cables?
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This is going to get a bit technical but should still be understandable even if you slept through chemistry classes. When is hydrogen dangerous? Just as with the fuel-air mixture in an engine, hydrogen is combustible only when it's within a range of concentrations. We use what are called the Lower Explosive Limit (LEL) and the Upper Explosive Limit (UEL) which are the concentrations of gas (in air) that will ignite. For hydrogen gas, the LEL is 4% and the UEL is more than 75%, meaning that if the concentration of hydrogen gas reaches 4%, it is at the level that could ignite with a spark. For comparison, the natural concentration of H 2 in the atmosphere is about 0.01%. How does a car battery produce hydrogen gas? A car's battery is filled with a mixture of 36% sulphuric acid (SO 4 ) and 64% water (H 2 O). Hydrogen gas is released when the battery is charging due to a process called electrolysis in which water decomposes into its constituent hydrogen (H) and oxygen (O) in the presence o
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