Preparation of materials: a basin of water, salt, baking soda, a basin, a spoon.
1. Pour table salt into the sink (table salt has a bactericidal effect).
2. Continue to pour a spoonful of baking soda into the sink (baking soda has a good effect on removing oil stains).
3. Mix the salt and baking soda evenly with your hands.
4. Soak the clothes in water for ten minutes.
5. Carefully rub the marks on the clothing with your hands.
6. The clothes have been cleaned.
Detailed information
Note
The liquid in the fluorescent rod contains dibutyl phthalate and phthalic acid. Dimethyl ester is harmful to humans. body.
The General Administration of Quality Supervision, Inspection and Quarantine collected 30 batches of fluorescent rods sur the market and tested the waterproof, anti-leakage and toxic and harmful organic content of fluorescent rod products. The results showed that all 30 batches of products had quality and safety risks. Among them, in 8 batches, when imitating child abuse operations (such as repeated bending 1-5 times), liquid gushed out or seeped into the folds, and more liquid flowed out when pressed.
There is a risk of poisoning by inhalation, poisoning by skin contact and poisoning by ingestion; dibutyl phthalate was detected in 26 lots and dimethyl phthalate was detected in 22 lots. Monitoring found that not all samples were labeled with implementation standards, manufacturers' names and addresses, and more than 90% of samples had no information in Chinese on the outer packaging labels .
The General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China proposed that most of the fluorescent substances contained in fluorescent rods contain low-toxic ingredients such as phthalate. dimethyl and dibutyl phthalate. , they can be sucked up by children. Or touching it can cause nausea, dizziness, paralysis, coma and other injuries.
People's Daily Online - The liquid in the glow stick is toxic Be careful with the glow sticks you buy in the market
Why do these luminous objects glow the night. ? Is there radioactivity that is harmful to the body?
1. Light energy is the form of energy corresponding to the movement of photons. Light energy is a form of energy released by luminous objects such as. sun and candles, light energy is a source of r energyrevolvable.
2. Solar energy is generated by the fusion of hydrogen and helium inside the sun to release enormous nuclear energy.
3. Light energy can be any light, and some lights do not have heat energy. Solar energy includes light energy and thermal energy.
Detailed information
1. Light energy is direct from a macroscopic point of view and fluctuates from a microscopic point of view, with a certain amount of energy. Light is a series of electromagnetic waves, also called the visible spectrum. In a scientific definition, light refers to the entire electromagnetic spectrum. Light is composed of photons as the basic particles and has both particle and wave properties, called wave-particle duality.
Light can propagate in transparent materials such as vacuum, air and water. There is no clear understanding of the range of visible light. The exact limit is that the wavelength of light that the average human eye can accept is between 380 and 760 nm. The light people see comes from the sun or from devices that produce light, including incandescent bulbs, fluorescent tubes, lasers, fireflies, etc. What is visible is called visible light, and the opposite is called invisible light.
2. Solar energy is the energy generated by the continuous nuclear fusion reaction process inside the sun.
The average intensity of solar radiation in Earth's orbit is 1369 w/㎡. The equatorial circumference of the Earth is 40,076 kilometers, so it can be calculated that the energy obtained by the Earth can reach 173,000 TW. The standard maximum intensity at sea level is 1 kW/m2, and the 24-hour average annual radiation intensity at a certain pointof the Earth's surface is 0.20 kW/m2, which is equivalent to 102,000 TW of energy.
Although the energy radiated by the sun in the earth's atmosphere is only 2.2 billionth of its total radiation energy, it reaches 173,000 TW, i.e. the energy radiated by the sun on this planet. the earth each second is equivalent to With 5 million tons of coal, the energy radiated to the earth per second is 1.465×10^14 joules.
Wind energy, water energy, ocean temperature difference energy, wave energy, and biomass energy on land all come from the sun; even fossil fuels (such as coal, oil, natural gas, etc.) on earth; the earth are basically It is said to be solar energy stored since ancient times, so solar energy in the broad sense covers a very wide range, while solar energy in the narrow sense is limited to conversion directte of photothermal, photoelectric and photochemical energy from solar energy. radiation.
Baidu Encyclopedia - Solar Energy
Baidu Encyclopedia - Light Energy
Baidu Encyclopedia - Light Energy
Baidu Encyclopedia - Light Energy strong>
Baidu Encyclopedia - Light Energy
Some fluorescent materials are paints, which constitute a layer light layer. They are usually fluorescent yellow-green when exposed to sunlight, they glow at night and last for several. hours. It will no longer be able to emit light but can be used repeatedly after being illuminated for a while. (Phosphor powder is generally divided into two categories: photo-induced energy storage luminous powder and radioactive luminous powder. Photo-induced energy storage luminous powder is a phosphor that stores light energy after having been exposed tonatural light, fluorescent lights, ultraviolet light, etc. After stopping the light irradiation, it is slowly released as fluorescence, so the glow can still be seen at night or in dark places, and the duration can be from several hours to more than ten hours. is fluorescent. The powder is mixed with radioactive substances, and the rays continuously emitted by the radioactive substances are used to stimulate the phosphor powder to emit light. This type of luminous powder shines for a long time, but its application range is limited due to. its toxicity and environmental pollution. ) This type of luminous powder is likely to contain it. It is best not to contact radioactive elements for a long time;
The other type is like the commonly used fluorescent stick. in concerts. If you look carefully you cansee that it is mainly a liquid fluorescent material. (Actually, this kind of light should be called "phosphorescence" rather than "fluorescence". The specific reason is that excited electrons transition to electronic energy levels are different. Before going into details, we need to first explain the difference between electronic excitation energy levels. For more details, you can read the preface of the chapter on fluorescence analysis in the instrumental analysis manual ) This type of light is molecular fluorescence. , which only involves the transition of valence electrons in the outer shell of the molecule to emit light, and the energy is very low. (The radiation emitted by unstable atomic nuclei can be alpha particles, beta particles, gamma rays, or neutrons. These energies are very high and are relatively deadly to the human body.) Additionally,in most fluorescent sticks, fluorescent substances (such as luminol, resorcinolphthalein, etc.) and excitation substances (such as hydrogen peroxide and other peroxides, etc.) (but sometimes to obtain different colors , different colored fuels are added) are stored separately. Typically, they are separated by fine or thin glass. hard plastic. When used, they are bent and broken so that the excitation substance and the fluorescent substance mix to stimulate phosphorescence. This is why glow sticks are hard when bought new. Only then can they light up and hear the “chirp”. ringing inside. So as long as you don't open the package and touch it or eat it directly (haha...I actually saw a group of little brats pour this stuff into their mouths, complaining to have a sore tonguet vomit fluorescent food in the dark. There will be no problem if the whole body shines, that's absolutely true...).
Okay that's it, if you still have any questions, keep chatting~