What is dry ice?
dry ice is frozen carbon dioxide, the same things that animals exhale and plants must perform photosynthesis. Due to the low temperature of -109.3 ° F (-78.5 ° C), the dry LED is useful as a coolant. It is also relatively easy to produce.
Sometimes scientists need only a small amount of dry ice. This can only be achieved by opening the valve of the liquid carbon dioxide and by placing the fabric bag through the drain nozzle. When part of the escape gas condenses on the fabric, the mixture of gaseous carbon dioxide and dry ice is produced. This approach is the easiest way to create a small amount of dry ice for laboratory use. First, liquefied carbon dioxide is made by compressing carbon dioxide. Because the temperature of the substance increases when compressed, the gas must be cooled during the compression process to support the formation of the liquid. If the gas inside the container is roughly at room temperature, liquefaction begins when the pressure is about £ 870 per square inch (ppsi) noBo about 6,000 kilopascals.
The next step is quite simple. In any piece of matter, certain molecules move very quickly and some move much more slowly. Their average speed is what we call the temperature. If the liquid nitrogen bathtub permits partially evaporate, more energetic molecules escape, causing the average momentum of molecules in the mixture, and thus its temperature, decrease. After enough heat evaporates, the temperature of the liquid drops under freezing, the phase transition occurs and we are left with a solid carbon dioxide - dry ice.
Dry LED is usually stored in insulated containers. When the air is exposed, the gas of carbon dioxide immediately issues, because the temperature -threespiece temperature between the dry ice and the environment is large enough to usually skip the liquid phase and turn into gas. Some carbon dioxide is converted into steam, giving him the appearance of the fog. Dry iceis used all the time to make an artificial fog for show. It can also be used in combination with laser light shows, scattering light so that it can be easily seen.