Yangtze River All Media News (Changjiang Daily reporter Song Lanlan Correspondent Shen Ao) Recently, the crow drinking water in primary school textbooks has become popular! Netizens from all over the country have conducted experiments to verify. Some netizens posted that the experiment found that the crow could not drink water at all. "It turns out that the stories in fairy tales are all lies!" Can crows drink water? Yesterday, students from Wuhan Yucai No. 2 Primary School also conducted experiments to find out.
Netizen: Elementary school textbooks are all deceptive
The story of "Crow Drinks Water" is all familiar with the students. Hu Ke from Yucai No. 6 (7) Class of Yucai No. 2 Primary School said that the protagonist of the story is a thirsty crow. After finding a bottle of water, the crow puts his mouth into the bottle, but the mouth of the bottle is too small and the water is too low. The clever crow throws the stone into the bottle and finally drinks the water.
This fable appears in primary school textbooks across the country. In different versions of textbooks, the bottles have different shapes. Some netizens listed the illustrations of "Crow Drinking Water" in four versions of the textbooks across the country, saying that only the bottles in the "Xi'an Normal University" version of the textbook are conical, and the crow can only drink water after putting it into the stone. The bottles in the other three versions of the textbooks, including the People's Education Edition, cannot drink water at all. Therefore, we came to the conclusion: elementary school textbooks are all deceptive! The topic of
has caused heated discussion. Some netizens think that "a big deal" is "a story that only allows children to understand the meaning behind the fables, and they are entertaining, so don't be too entangled"; some people are serious about saying "this is science."
experiment: Four containers verify
one by one "Did the textbook lie to me?" Liu Jiefei, the subject leader in Jiang'an District and science teacher at Yucai No. 2 Primary School, led the sixth grade students to test the authenticity. The students of
Class 6 (7) were divided into four groups, and four containers of different shapes, including conical flasks, flat-bottom flasks, gas collection cylinders, and conical measuring cylinders, were collected, and stones of different shapes and sizes were collected.
Before the experiment, the students analyzed several factors that may affect the "crow drinking water": the amount of water, the number of stones, the shape of the stones, and the shape of the bottle. Then, one by one, verify it one by one.
Four types of bottles contain about 1/3 of the water. Each group threw stones into the bottle. Because the amount of water was too small, the stones quickly covered the water surface, and it was impossible to let the water rise to the mouth of the bottle.
The second set of experiments, the water depth of various containers exceeded 1/2. After comparison, the students found that when the water depth does not reach 1/2 of the container, the crow cannot drink the water anyway. With the water depth exceeding half, the crow can successfully drink water by reasonably putting stones of size and matching stones.
The small and large conical measuring cylinder under the bottle body, when the water depth is just halfway, the water level cannot reach the bottle mouth. Too many stones will cover the water surface and the water cannot reach the bottle mouth. "Unless there is a lot of water in the bottle, such as 3/4 of the container, and in this case, the bottle mouth is so big that the crow can stick its head in and drink the water without the need for stones." said Teacher Liu Jiefei.
Conclusion: The water depth is more than half, and the crow can drink water
After experiments in four containers, the students found that the most important factor in whether the water in the bottle can rise to the mouth of the bottle is how much water. "If there is too little water in the bottle, no matter what shape the bottle is, the crow will not drink water. If the water in the bottle exceeds half, the crow will be able to drink water in most cases." Tan Ershun, a Class 6 (7), came to the conclusion.
"The size and matching of stones is also very important", added Zhou Yujie from the same group. Teacher Liu Jiefei explained that this is a "porosity" problem. "If the large and small stones are matched, the porosity between the stones will become smaller and the water level will be more likely to rise; if only large stones are used, the porosity will become larger and it will be difficult for the water to rise to the bottle mouth."
After some experiments, the students wrote a report: Whether the crow can drink water is the amount of water in the bottle, the size and shape of the stones; the shape of the bottle will also affect the results. Generally speaking, if the bottom is large and the top is small, more water can be raised, while if the bottom is small and the top is large, it is more difficult to drink.
