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Fuel is a substance that can convert its stored chemical energy into thermal energy through chemical reactions (combustion). The fuels used by cars are mainly gasoline and diesel. As the number of automobiles increases year by year, the problems of environmental pollution caused by automobile emissions and the gradual shortage of oil resources cannot be ignored. Therefore, various alternative fuels are becoming more and more widely used.
Alternative fuels developed and used in China include natural gas, liquefied petroleum gas, methanol, ethanol, biomass fuel, hydrogen and dimethyl ether.
Detailed information;
The role of water
1. Balance body temperature
After absorbing heat. , water, its own temperature change is relatively small. InBecause of its extraordinary heat-dissolving power, water plays a vital role in helping the body regulate body temperature.
2. Maintaining cells
Water is an important element in the structure of the human body. It promotes cellular metabolism, helps maintain the normal shape of cells and the composition of complete cell membranes, and maintains the lubrication and elasticity of the skin. It plays a key role in maintaining normal cellular functions. Water is closely linked to our physical health. .
Reference source: Baidu Encyclopedia - Fuel
Once electrical equipment catches fire, water cannot be used to directly extinguish the fire. Since water generally contains conductive impurities, dust and impurities sprayed onto energized equipment and then seeping into the equipment are more likely to conductand electricity. If you use water to extinguish a fire, it will also reduce the insulation performance of electrical equipment, cause a short circuit to ground, or endanger the safety of nearby firefighters. Therefore, extinguishing agents such as carbon dioxide, carbon tetrachloride, "1211" and dry powder are generally used to extinguish fires because these extinguishing agents are not conductive. However, after a fire breaks out in oil-filled equipment such as transformers and oil circuit breakers, water can be sprayed as mist to extinguish the fire. Because the water mist has a large surface area and covers the flame, the small water droplets can easily absorb heat and vaporize, quickly reducing the flame temperature; the increasing flow of smoke causes the water particles to slowly fall from the slurryllard in suspension, which is more conducive to heat absorption. and vaporization; The falling small water droplets float on the surface of the oil, which also lowers the temperature of the oil surface and weakens the vaporization of the oil, thereby weakening the flame and extinguishing it.