Category: Life >> Common sense of life
Analysis:
Adding salt to water can increase the water point 'boiling.
Water molecules in the liquid state tend to stick together to form droplets, ponds or oceans. However, highly energetic water molecules can overcome this force that binds them to other water molecules and break away from the liquid surface as water vapor. At any time, some water molecules leave the water surface, a phenomenon called “evaporation.”
As the temperature of the water increases, the number of water molecules with enough energy to escape the water also increases. Water boils when the pressure generated by water molecules breaking away from the surface of the liquid exceeds the pressure of the surrounding air. After adding energy to the water by heating it and raising the water temperature to 100 degrees Celsius, theThe water usually starts to boil.
But when you add salt to the water, the problem becomes more complicated. Sodium chloride (refined table salt) dissolves easily in water, decomposes into sodium ions and chloride ions and diffuses inside the liquid. Now, if water molecules want to turn into water vapor, they must free themselves from the attraction of other water molecules and get rid of the constraints of sodium ions and chloride ions. Therefore, it requires more energy, so the temperature required to generate water vapor is also higher.
What does it mean to use water, salt and activated carbon to form a galvanic cell in order to promote the reaction
< p> In fact, it cannot produce electricity.What you added only increased the electrolyte, which means the internal resistance of the battery is reduced and the conductivity is increased. ThisThe old battery seems to have power again when used, as you feel the little light. The light bulb lights up or the little toy can move again.
The principle of the battery is actually a redox reaction. Electrons are transferred through the graphite rod in the middle (general dry cell), so there is electricity. Salt water and urea do not undergo redox reactions and therefore cannot produce electricity on their own.
For larger batteries, like car batteries, you sometimes go to a service shop to add water or something like that. Actually, it's not water, but sulfuric acid or something.
The hot patch uses the heat released by the iron oxidation reaction to generate heat. In fact, it is based on the principle that iron absorbs oxygen and corrodes in humid air. At the same time, the foThe adsorption property of activated carbon is used to store water vapor in the loose structure of activated carbon, and the water vapor is liquefied into water droplets.
The outgoing stream comes into contact with air and iron powder and reacts relatively quickly under the catalytic action of sodium chloride to generate iron hydroxide, releasing heat. The reaction rate of iron oxidation under natural conditions is slow. If you can speed up this reaction, you can try increasing the surface area of the iron.
Use water, salt and activated carbon to form a primary battery to promote the reaction, and you can obtain the temperature required by the heating bag and become the heat source of the heating bag . The raw material layer in the hot patch can release heat continuously within 12-20 hours under the action of air oxygen. This reaction process begins as soon as you openOpen the package. Pretend to start.
Detailed information:
Functional uses
1 To prevent cold and keep warm, to Apply heat to the body and warm the palate. It can warm the stomach, provide menstrual care, heat when applied, quickly apply hot compress, reduce swelling, relieve pain, activate blood circulation and eliminate blood stasis, and is widely used in various fields. types of chills.
2. Quickly relieves and eliminates pain caused by various cold diseases. It is suitable for patients with arthritis, frozen shoulder, waist and leg pain, rheumatism and cold limbs and pain in the affected area. in the cold Ready-to-use product that provides rapid pain relief.
3. It repels the cold and keeps you warm, promotes the body's microcirculationhuman and has good swelling and analgesic effects on frostbite of hands and feet, bone injuries, muscle injuries and other symptoms.
4. Promote the smooth flow of meridians, use hot compresses on relevant acupoints to eliminate symptoms such as stomach cold discomfort and blocked menstrual blood, and have the effect of promoting blood circulation and d eliminate blood stasis.