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Dry ice is a solid form of carbon dioxide, widely used in fog machines. It gets its name because it sublimates, transitioning from solid to gas. If you're interested in purchasing dry ice, this guide from Mytour will help you understand how to buy and use it safely.
Steps
Purchasing and Transporting Dry Ice
Buy dry ice from specialized stores. You can search online for stores that specialize in dry ice sales.
- Try to purchase dry ice as close to the time you need it as possible. Dry ice continuously transitions from solid to gas, and its shelf life is short. Every 24 hours, 2.5 to 5 kg of dry ice will sublimate into gas.
- While anyone can generally buy dry ice, some stores require you to be at least 18 years old to make a purchase.
Purchase dry ice in block form. Demonstrations at schools and fog effects typically require dry ice in block form.
- Dry ice is also available in pellet form, but it is mainly used for cleaning surfaces or in medical applications.
- The price of dry ice typically ranges from 40,000 VND to 60,000 VND per kilogram. Though prices can vary depending on quantity and the seller, it is generally quite affordable.
Store dry ice in insulated containers like coolers or ice chests. Dry ice is much colder than standard freezers (-78.5°C), so it cannot be stored in regular freezers or refrigerators.
- The better the insulation of the cooler or chest, the slower the sublimation of the dry ice.
- Avoid frequently opening the cooler to slow down the sublimation process. You can also use foam to fill any empty space inside the cooler to slow the sublimation further.
- Storing dry ice in the freezer can cause the thermostat to malfunction. Due to the extremely cold temperature of dry ice, the freezer will automatically shut off to prevent food from freezing too much. If this happens and your freezer malfunctions but food still needs to be stored, dry ice can be placed inside the freezer to help.
Place the cooler with dry ice in the car and roll the windows down. Remember that dry ice is made of carbon dioxide, and inhaling large quantities can be harmful.
- Ventilation is crucial if transporting dry ice for over 15 minutes. If you transport dry ice in an area without proper ventilation, you risk shortness of breath and headaches, and prolonged exposure can even be fatal.
Handling Dry Ice
Wear leather gloves and long sleeves when handling or unloading dry ice. While brief contact with dry ice is harmless, prolonged exposure to it can freeze skin cells, causing burns similar to fire burns.
- Cooking gloves or towels can also help, but they don't offer the same level of protection as specialized gloves. Handle dry ice like you would handle a hot pan, and avoid direct skin contact.
- Treat dry ice burns like normal burns. If the skin just turns red, it will heal quickly. For more severe burns, such as blisters or peeling, apply antibiotic ointment and bandage the area. If the burn is serious, call a doctor.
Store unused dry ice in a well-ventilated room. Storing dry ice in an air-tight space with large quantities can lead to oxygen depletion in the room.
- A locked shed in the backyard typically has good airflow and will not pose a suffocation risk for people or animals. If you can't find a suitable place to store dry ice, consider asking a chemistry teacher if the school's chemistry lab can accommodate it.
- Keep the dry ice out of reach of children and pets.
Open doors and windows where dry ice is being disposed of. Dry ice will continue to sublimate, but it must be able to disperse easily into the air.
- Since dry ice is heavier than oxygen, it will accumulate in low-lying areas when it sublimates. Avoid leaning over any depressed or closed areas, as these regions will have the highest concentration of carbon dioxide.
Leave dry ice in a well-ventilated area at room temperature when you need to dispose of it. If there's any leftover dry ice, remember that it will continue to sublimate, and simply leave it to dissipate until it completely evaporates.
- The backyard is a good place to discard dry ice. Make sure no one approaches the area for at least 24 hours.
- You can also use a fume hood to dispose of dry ice. A fume hood is a ventilated cabinet used for storing hazardous chemicals. Your school's chemistry lab may have one where you can dispose of leftover dry ice, but be sure to ask the teacher for permission first.
Things to Avoid
Do not store dry ice in a completely sealed container. The sublimation of dry ice into carbon dioxide gas will cause the container to expand and potentially explode.
- Dry ice can erupt violently if contained too tightly. Some individuals have even been charged with intentionally sealing dry ice in a container until it explodes, creating a 'dry ice bomb.'
- Do not store dry ice in metal or glass containers, as an explosion could result in sharp 'shrapnel' that could slice skin or cause serious injury.
Avoid storing dry ice in basements, cellars, cars, or any other enclosed areas. The carbon dioxide from dry ice will gradually displace oxygen and can lead to suffocation.
- Before entering a space that once contained dry ice, be sure to ventilate it thoroughly to let the air circulate.
Try not to leave dry ice unattended. Even if no one is around, dry ice can still spill or cause issues if not carefully monitored.
- Do not place dry ice on hard surfaces like stone floors or countertops, as its extreme cold can crack or damage the surface.
Do not dispose of dry ice in drains, sinks, toilets, or trash bins. This could cause water in the pipes to freeze, possibly leading to pipe bursts.
- The tightness of the pipes can accelerate the expansion of dry ice and even cause an explosion.
