A lot of people like [Interesting Unpopular Knowledge], and I'll share it with you today. People will inevitably encounter this or that thing in their lives, and learning some [interesting less popular knowledge] is very useful, so I suggest everyone to learn more and share more!
10 interesting scientific knowledge in everyday life
1. Black substance in a black and white photograph: silver.
2. The melting point of gold is 1064.4°C, which is much higher than that of other metals. Which is about 3 times higher than melting point of gold.
3. Metal used to make metal foil (metal paper) for tobacco and candy packaging: aluminium.
4. The harm of acid rain is main manifestation of environmental pollution. The main cause of harm from acid rain are: sulfur dioxide, nitrogen dioxide, etc., released during combustion of fuel.
5. Oil will float on surface of river, and density of oil is lower than that of water, two fluids are incompatible. Therefore, oil will float on surface of river.
6. Some Chinese-style building window and door structures are made of copper-colored carbon tool steel by electroplating. The composition of carbon tool steel is Al-Cu-Mg-Mn-Si aluminum alloy.
7. After a mosquito bite, a person's skin itches or swells. A simple solution: a dilute solution of sodium hydroxide or bicarbonate in nano-water.
8. The sunflower flower faces sun, and sunflower flower will rotate with sunlight when it meets light source, but this refers to period from budding of main stem to opening of petals, its leaves and bottom of flower pot. All this is accompanied by rotation of sun and changes from east to west until flower pot blooms, it is not easy to turn again, but immovable house is turned to cultivation.
9. In polyclinics and hospital emergency departments, barium flour contrast method is common for examining diseases such as esophagus and stomach. Chemical used as "barium flour": barium sulfate.
10. The sodium oxide contained in normal saline, which is dripped in outpatient service of hospital, is approximately equal to concentration of sodium oxide in blood. Molar mass of NaCl in brine: 0.9%.
Five Interesting and Mysterious Popular Science Knowledge
1. Russia has a land area of 17 million square kilometers, while Pluto has only 16.57 million square kilometers, so scientists will be kicked out of planetary family!
2. Before people knew how to extract oil, people used whale oil from their bodies as fuel, killing whales!
3. Thunderstorms often occur on Lake Maracaibo in Venezuela. Scientists believe that this is caused by a combination of airflow and local terrain!
4. Air and water are necessary substances for survival of all life on earth. If there is no air and water on earth, all living things will die out!
5. Scientists call sun's atmosphere "crown". The heat of corona is higher than that of Sun itself, about 600 times greater than that of surface of Sun!
July 26, 2023
July 26, 2023
July 26, 2023