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Anonymous users2024-01-24The phenomena that can be seen when igniting biogas are: 1. There is a large amount of heat generated (the calorific value of biogas is 5500 kcal), 2. There will be water vapor (carbon dioxide and water are produced after methane combustion), 3. The most direct thing is to see the fire.
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Anonymous users2024-01-23Do you want to know what biogas can be used for, after it is ignited in the kitchen, it can be used for cooking, boiling water, and heating. The phenomenon is a blue flame.
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Anonymous users2024-01-22The score is very high, and the panic is very high, and the irony is ironic.
A. It is easier to cut vegetables after sharpening the knife quickly, which is to reduce the force area to increase the pressure when the pressure is constant, so A is correct; >>>More
A. Objects can be distinguished by timbre Knock raw watermelon and ripe watermelon respectively, the timbre they produce is different, and my mother knocks on the watermelon bought by Xiaohong a few times and says that it is not ripe - use timbre to distinguish raw and ripe watermelon This option is wrong >>>More
A, through the timbre can distinguish the object Knock the raw watermelon and the ripe watermelon respectively, the timbre they produce is different, and the mother knocks on the watermelon that Xiaohong bought a few times and says that it is not ripe - use the timbre to distinguish between raw and ripe watermelon This option is wrong and in line with the topic >>>More
Analysis of test questions: A. Clean the oil pan with detergent, and the emulsion is formed, so the detergent has an emulsifying effect, which is correct but does not meet the meaning of the question, so the choice is wrong; B. Gas combustion releases heat, so using a gas stove to fry vegetables is to use internal energy to heat the object, but it is correct but does not meet the topic, so the choice is wrong; C. The "white gas" coming out of the lid of the pot when cooking rice is the small droplets formed by the liquefaction of water vapor in the pot, not the water vapor formed by vaporization, the water vapor is a colorless gas, which is invisible, and the original question is wrong and in line with the question, so the choice is correct; D. Boiling beef in a pressure cooker is easy to boil, because the boiling point of the liquid increases with the increase of air pressure, so the temperature rises, the easier it is to rot the boiled beef, which is correct but does not meet the topic, so the choice is wrong;
Oh, you mean that alcohol block! It was as if the alcohol cube was placed in a small small stove and then lit with a lighter and put it in. >>>More