Free technical library
Why does ice float? Detailed answer
![Big encyclopedia for children and adults Big encyclopedia for children and adults](https://www.diagram.com.ua/images/section-big-encyclopedia.png)
Directory / Big encyclopedia. Questions for quiz and self-education
Comments on the article
Did you know?
Why does ice float?
Ice floats because, unlike most other substances, the crystallization of which is accompanied by an increase in density, when water freezes, it expands abruptly (its density drops abruptly).
The reason for this phenomenon, physicists say, is the peculiarities of the structure of ice and water. Water molecules, consisting of one oxygen atom and two hydrogen atoms, look like balls with bulges. In an ice crystal, they are arranged in such a way that the bulges (corresponding to hydrogen atoms) are oriented strictly in the direction of two neighboring molecules. As a result, a three-dimensional crystal lattice appears, consisting of almost ideal tetrahedra. Each molecule at its vertices is surrounded by four others.
Water does not have such an ordered structure; the arrangement of its molecules changes all the time. But at any moment each water molecule is surrounded by 4-5 "neighbors", so their average number is 4,4. This means that water molecules in a liquid are closer together than in a crystal, and therefore water is denser than ice.
Author: Kondrashov A.P.
Random interesting fact from the Great Encyclopedia:
What drink did the Germans invent, having lost the supply of ingredients for Coca-Cola?
At the beginning of World War II, the German Coca-Cola bottling factory lost its supply of ingredients from the United States. Then the Germans decided to produce another drink from food waste - apple pomace and whey - and called it "Fanta" (short for the word "fantasy"). The director of this plant, Max Keith, was not a Nazi, so the common belief that the Nazis invented Fanta is a delusion. After the war, Keith contacted the parent company, Coca-Cola regained ownership of the factory and did not abandon the new drink, which had already gained popularity.
Test your knowledge! Did you know...
▪ How was the American Edison's phonograph received in France and Russia?
▪ How harmful is television to our health?
▪ Which nation forbids marriages between native speakers of the same language?
See other articles Section Big encyclopedia. Questions for quiz and self-education.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Artificial leather for touch emulation
15.04.2024
In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>
Petgugu Global cat litter
15.04.2024
Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>
The attractiveness of caring men
14.04.2024
The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>
Random news from the Archive Budget tracker with Bluetooth for monitoring children
28.10.2014
A startup project from South Korea has appeared on the crowdfunding platform Indiegogo, which offers a Lineable bracelet to track the location of children. Developers offer a gadget for only $ 5.
The device is a beacon in the form of a bracelet worn on the arm. The beacon uses low-energy Bluetooth to communicate with an iOS or Android smartphone.
It is reported that the device has modifications of three different sizes. The beacon is completely waterproof. The control unit of the device is in a shell made of and sealed with silicone. The battery is enough for 1 year of work.
If the child goes beyond certain limits, the application starts to give an alarm. In addition, each smartphone running the Lineable app transmits to the cloud system information about the location of the same bracelets found nearby. The transfer of information is carried out anonymously, and it is received by specific parents.
The new product is expected to go on sale in February 2015. After that, the team is going to start releasing products using the same technology, but for a slightly different purpose: product finders, pet collars, etc.
Previously, the minimum price for this type of device with low energy Bluetooth was about $20 (TrackR, Tile, etc.). It's surprising that at $5 a device, a company can be profitable without pervasive distribution networks and huge sales volumes.
|
Other interesting news:
▪ Network video intercom Axis A8004-VE
▪ Bats' immunity to transmissible viruses explained
▪ Viruses are 10 times stronger in the morning than in the evening
▪ Orange sky
▪ Household bacteria will tell about your personal life
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site Standard instructions for labor protection (TOI). Selection of articles
▪ article What artist dies! Popular expression
▪ article Where Can Mexicans and Tourists Practice Illegal US Border Crossing? Detailed answer
▪ article Rooster millet. Legends, cultivation, methods of application
▪ article Electronic guide. Encyclopedia of radio electronics and electrical engineering
▪ article Management of the collector electric motor. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
![www.diagram.com.ua www.diagram.com.ua](https://www.diagram.com.ua/images/main-bottom-diagram.png)
www.diagram.com.ua
2000-2024