The kindergarten ice melted, the science experiment principle
The principle of the ice melting science experiment mainly involved the absorption of heat and the transformation of the state of matter. From a macro point of view, when ice is exposed to external heat, its temperature will gradually increase. If it continues to absorb heat, it will melt. For example, if ice is placed in hot water, the ice will become smaller until it melts into water. If ice is crushed and placed in water, the ice will also melt into water. Moreover, the hotter the object, the faster the ice melted, and the colder the environment, the slower the ice melted. At the molecular level, ice and water were both made up of water molecules. Inside the ice, water molecules attracted each other, forming a regular three-dimensional structure that kept the ice solid. When the temperature of the ice rose, the irregular movement of the water molecules became more intense. When the intensity reached the point where it could break free from the mutual attraction, the three-dimensional structure of the ice would fall apart, turning from solid to liquid, which meant that the ice would melt into water. Read more exciting novels for free
Science experiment evaporated in kindergarten
The following are some small experiments on evaporating that are suitable for kindergarten: 1. ** Add water and observe the evaporating ** - [Experiment Materials: Alcohol Lamp, Beaker, Water] - ** Experimental steps **: First light the alcohol lamp, fill the beaker with water, and then heat the beaker on the alcohol lamp. After heating it up, he guided the child to observe the changes in the water in the beaker. - [Experimental principle: When water is heated, water vapor will be produced. The phenomenon of water vapor running up is called "evaporating."] This was because when water was heated, the molecular movement intensified, and the liquid water turned into gaseous water vapor, and this process of turning from liquid to gaseous was called evaporating. 2. ** Observing the evaporating in daily life ** - [Experimental steps: Guide the child to think about the phenomenon of evaporating seen in daily life, such as the water on the ground slowly drying after the rain, or the phenomenon of wet clothes drying after drying.] This was because the sun's rays caused water to heat up. 70% of the Earth's surface was covered by water. When water was heated, it changed its form and turned into invisible water vapor. This process was called evaporating. Three-quarters of the water vapor in the atmosphere comes from the ocean, and the rest comes from rivers, lakes, and moist land. 3. ** Bubble Evasion Experiment (extended understanding)** - [Experiment Materials: Water, dishwashing liquid, glue, straw, gloves] - ** Experimental steps **: First, prepare a mixed solution of water and dishwashing liquid in a ratio of 3:1. Dip a straw into the solution and blow out bubbles (this kind of bubble is easy to break). Then, mix the glue and the mixed solution in a ratio of 1:2. Dip the straw into the solution and blow out bubbles. Wear gloves to touch the bubbles. - [Experiment Principle: The bubbles in Step 1 will explode due to the water evaporating.] This involved the thin film formed by water on the surface of the bubble. The bubble was easy to break due to the condensation of water, which also reflected the phenomenon of condensation. After adding glue, it would become very sticky, and the moisture would not evaporate easily. The strength of the bubble membrane would increase, so it could jump on the back of our hands. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Principle of Gene Complementation Experiment
The principle of the gene complementation experiment (cis-tra test) was to determine whether two mutants belonged to the same gene (cistron) based on the cis-expression and trans-expression. If the two mutations showed complementary effects, it proved that the two mutants belonged to different genes; if they could not show complementary effects, they belonged to the same cistron. Specifically, in the complementation experiment, when two mutations were on two different types of DNA (trans-type, trans-type), it was a mutant type. When two mutations were on one of the two different types of DNA, and the other two were normal (cis-type, cis-type), it was a wild-type DNA. The phenomenon of different morphologies due to different arrangements is called the cis-reverse position effect. For example, if two different T4rII mutants co-infected the restricted host E.Coli K strain, if the two mutated viruses did not affect the same function, they could complement each other so that their respective DNA could be replicated in the E.Coli K strain. During the replication process, they would recombine with each other to form wild-type viruses. After repeated infection and cleavage of the restricted host, the wild-type viruses could form clear plaque. In this way, it was possible to distinguish the complementation groups that different mutants belonged to.
Who is the enemy of the melted ice?
The enemy of the Melted Ice was the God of Emotions, Huo Yuhao. Rong Nianbing and Huo Yuhao were both characters in the fantasy novel " The Ice and Fire Demonic Chef " and its derivative works by the Tang family's Third Young Master. Rong Nianbing was the God of Emotions, while Huo Yuhao was the winner of the Battle of Gods. There was some conflict and competition between them. Huo Yuhao had used the emotions of Rong Nianbing's mother when she died in the battle with Rong Nianbing, which triggered the hatred in Rong Nianbing's heart. This also caused Rong Nianbing to have a strong hatred for Huo Yuhao. While waiting for the anime, you can also click on the link below to read the classic original work of The King's Avatar!
The principle of the kindergarten activity area is
The main principles for the creation of the kindergarten activity area were as follows: ** 1. Setting up of regional activity spaces ** 1. ** Scientific Principle ** - We should actively develop three-dimensional and outdoor space and expand the scope of activities. We should not only be limited to indoors and desks, but also use walls, floors, windowsills, windows, corridors, and outdoor environmental resources. - Grasp the actual needs of children and fully consider the age characteristics and interests of children. To provide areas that children are interested in, to provide more venues for areas where children are more concentrated, and to adjust the regional activity environment creation according to the growth of children's age. For example, the upper class should set up more exploratory activity areas than the lower class. 2. ** In terms of solving the problem of event order ** - Regional planning should be both reasonable and open. For example, the quiet area should be reasonably separated from the noisy area, and the related areas should be set close to each other. - The creation of environment in regional activities should be conducive to children's full freedom, independent play, and subjective initiative, but also integrate order into it. ** 2. Regional event materials ** 1. ** Principle of Validity ** - Teachers should conduct targeted and purposeful observation and analysis when putting in materials. They should conform to the current life experience and actual needs of children, and should not pursue more, more, simpler, or less materials. - During the process of using the materials, the guidance and auxiliary functions of the kindergarten teachers should be actively played. When necessary, demonstration operations should be carried out to fully play the role of the material as a support. - Pay attention to the level and dynamic nature of the regional activity materials. Different materials were prepared for children of different ages. The activity materials for children of the same age could be replaced and updated in time through the participation of teachers and children in the transformation of old toys. 2. ** Principle of Interactivity ** - On the basis of ensuring effectiveness (that is, children are interested in it, often use it, and can effectively play a role), the interaction of the materials is pursued, and the maximum effect is achieved on the basis of ensuring economic application. ** III. Autarchy and educational aspects of regional activity environment creation ** 1. ** Principle of autonomy ** - When creating the environment, it should point to the kindergarten's curriculum concept and curriculum goal, and should not deviate from them. It should be carried out around a unified goal. There is a relationship between the regional activity goal and the kindergarten's curriculum goal as a whole and a part. - The creation of regional activity environment and the selection of materials should be related to the content of the kindergarten curriculum. The practicality of the area is greater than the decoration. 2. ** Principle of Education ** - The creation of regional activity environment should be beneficial to the design, organization and implementation of kindergarten curriculum, and permeate into the development of other activities. At the same time, the children were required to participate in learning on their own, enhance communication with parents and teachers, promote hands-on operation skills, stimulate curiosity, and promote all-round development. In addition, there were also applicable principles. They had to consider the children's age characteristics, their practical abilities, and the direction of their future development. They had to carry out an overall layout and planning of the children's activity space to satisfy the children's physical and mental characteristics, age characteristics, and nature. They had to provide a diverse entertainment and living environment for the children to freely display their imagination, creativity, and thinking ability. The dynamic principle was to provide guidance for the children's activities in different areas. It had to be layered and dynamic. According to the differences in the children's personalities, it would provide a variety of rich materials and content. It would adopt a partition design to ensure that the children of different classes could improve their knowledge. There had to be a dynamic choice in the color tone. The principle of wholeness required the development of wholeness, the provision of diverse content design, and the construction of space for the development of imagination and creativity. Starting from the design concept of the kindergarten, the educational principles, and the children's own ability to accept, they should jointly construct plot and interaction content so that children could interact and increase their knowledge and skills. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Principle of Rainbow Light and Shadow in the kindergarten
The formation of rainbow light and shadow was related to refraction and reflection. Sunlight was actually a combination of seven colors of white light. When it was affected by certain optical conditions, color separation would occur. During the formation of the rainbow, there are many small water droplets that we can't see scattered in the air after the rain. These small water droplets can refracted and reflect sunlight. When sunlight enters the water droplet, it will be refracted into the water droplet. After the light is reflected once by the inner wall of the water droplet, it will be refracted out of the water droplet. This process includes two refracted and one reflected. Because different colors of light have different angles of refraction, the emitted light will form different colors. Finally, we can see a rainbow. Among them, the red light refracted at an angle of about 42°, and the purple light refracted at an angle of about 40°. Therefore, the light in the rainbow would be red in front and purple behind. This was the bright rainbow band that we usually saw, also known as the main rainbow. At the same time, there was a blurry rainbow outside the main rainbow, which was in the opposite color order from the main rainbow. It was called the secondary rainbow (neon). The secondary rainbow was formed by sunlight entering from the bottom of the water droplet, and after two reflections and two refraction. Due to the additional reflection, the rainbow's seven-color arrangement was opposite to the rainbow. Moreover, due to the additional reflection, a portion of the light was lost, so the brightness of the rainbow was lower than that of the rainbow. In kindergarten, there were some simple ways to demonstrate the principle of rainbow light and shadow. For example, using a triangular prism to refracted sunlight could break down white light into seven colors of light. This was because the triangular prism refracted different colors of light to different degrees. Purple light had the greatest degree of refraction, and red light had the smallest degree. Thus, one could see the colorful arrangement of light. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How much ice has melted in the Arctic?
The Arctic iceberg had melted by 40%. According to multiple reports and data, the Arctic ice coverage had decreased by 40% since 1979. This meant that a significant portion of the Arctic's glaciers had disappeared.
A scientific experiment on colored milk in kindergarten
The scientific experiment of colored milk in kindergarten was often called the "rainbow milk" or "milk fireworks" experiment. Here are the steps: 1. Prepare ingredients: Milk, food coloring, dishwashing liquid, cotton swabs, plates. 2. Operation process: - He poured the milk into a paper plate (the amount of milk should at least cover the bottom of the plate) and let the milk settle for a while. - Drip a drop of food coloring into the center of the milk (such as red, yellow, green, and blue, about 1 drop of each type). - Dip the cotton swab into the dishwashing liquid, put the tip of the cotton swab dipped in dishwashing liquid into the middle of the milk with the dye, and let it stand still for 10 - 15 seconds. You will see a variety of colors spreading outward on the surface of the milk with the cotton swab as the center. You can also continue to drip another drop of dishwashing liquid on the end of the cotton swab, and then put the cotton swab in different positions of the milk. Colorful colors will appear wherever the cotton swab goes. Finally, take out the cotton swab, and the colors in the plate will continue to move. The scientific principle was that the density of milk was slightly higher than that of the paint, so several kinds of water-based paint could float on the surface of the milk for a short time after being added, and the paint was not dissolved in the milk. The dishwashing liquid was a kind of a surface active agent, while the milk contained both fat and oily substances as well as water. After the dishwashing liquid was dripped into the milk, the oil-affinity and water-affinity properties of the paint would constantly take effect. After the dishwashing liquid (surface active agent) was added, the surface tension of the paint would rapidly decrease and form a diffusing effect. The paint in it could only "drift with the flow", constantly changing its movement, moving, diffusing, rotating, and gradually evolving into a colorful and ever-changing pattern. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The principle of artificial ice rink cooling
The cooling principle of the artificial ice rink was mainly based on the transfer of heat, which could not be separated from water and cold sources below 0 degrees Celsius. The following is the basic principle of cooling: 1. ** Cooler vaporized and absorbed heat **: The ice rink was like a large pool, with dense pipes laid in the cement layer. When making ice, an appropriate amount of water was first injected into the pool, and then a refrigerator such as nitrogen (NH3) with a boiling point of-33.4 degrees Celsius was used. The compressed liquid nitrogen was transported to the dense pipe to vaporize. During this process, the liquid nitrogen absorbed the heat of the cement layer and the water, causing the temperature of the water in the pool to drop and condense into an ice layer. 2. "** Circulation of the refrigerator **: After vaporizing the nitrogen, it becomes gaseous nitrogen with low temperature and low pressure. Then, the turbine will turn it into a high temperature and high pressure state and send it into the heat sink. The heat will be released in the heat sink, and the liquid nitrogen will return to normal temperature. Then, it will enter the dense tube for the next round of cooling cycle, so as to maintain the low temperature state of the ice arena and ensure that the ice layer does not melt. 3. ** The application of new cooling technology **: For example, the Beijing Winter Olympics used carbon dioxide as the refrigerator for the first time and the ice maker technology that directly evaporated under the ice. This technology was green, low-carbon, and energy-efficient. It could create a better ice surface for athletes with a uniform hardness and stability. While watching the Olympics, you can also read the wonderful novels related to the Olympics!
The working principle of the ice skating car
The working principle of the ice pouring vehicle was as follows: the scraper on the ice plow of the ice pouring vehicle scraped the ice surface to ensure the smoothness of the ice surface, and then the ice chips scraped by the scraper and the ice skates were collected through the horizontal and vertical transmission system. Then, the ice washing system was used to clean the stains on the ice surface, and the sewage was pumped into the ice washing tank through the water pump. After the ice repair operation was completed, the ice chips collected in the snow tank were dumped to the designated place. In addition, there was a knife under the ice pouring cart, which could cut the potholes on the ice surface. After that, the ice surface could be melted by pouring warm water at 45 ° C. During this process, the hot water would cool down, making the ice surface very smooth and flat. If ice water was used, the new ice surface would be more brittle than the ice surface poured by hot water, which was not conducive to competition. Moreover, the entire surface of the ice surface formed by pouring warm water on the ice was naturally formed, and the relative molecules were unified and stable. While watching the Olympics, you can also read the wonderful novels related to the Olympics!
Interesting science experiment
These search results provided some interesting information about science experiments. These experiments included the rainbow flower experiment, the egg-swallowing bottle, the unbreakable plastic bag, the coin in the water, the floating and sinking of the egg, the color-changing celery, the balloon grabbing the cup, the impenetrable paper, the balloon with static electricity, the fire extinguisher, the principle of the vacuum cleaner, the candle that could not be blown out, the little divers, the friction electricity, the wind on the wall, and so on. These experiments could be done by using common items at home. It was simple and interesting. Through these experiments, children could experience the charm of science and improve their scientific quality and hands-on ability.