WARNING: Dry Ice is extremely cold! (-78C/-109F) and can cause instant frost-bite to exposed skin. This project should not be attempted without adult supervision and adequate training. Ingestion of dry-ice may cause serious internal tissue damage. If Dry Ice is ingested, drink copious amounts of warm water as soon as practical. Misuse, or careless use may result in serious injury. Use of this video content is at your own risk.
Step 2: Dry-Ice (With a Fire Extinguisher??)
You may remember in a previous project how we used a Carbon Dioxide (CO2) fire extinguisher to produce dry ice. For this project, I tried discharging the entire 15lb extinguisher to see how much we could get, and ended up with 5 lbs of dry ice. Not bad!
If you haven't seen the video on how to make dry ice with a CO2 fire extinguisher, check it out here;
Certain fire extinguishers utilize CO2 as the medium for suppressing fires. These types are mainly found in restaurant kitchens, mechanical rooms, and in areas that hold sensitive equipment like computers.
CO2 fire extinguishers are usually charged with food grade CO2 and are referred to in terms of pounds. For example, a 5lb CO2 extinguisher is charged with a 5 lb weight of liquid CO2. The extinguisher is then highly pressurized.
CO2 fire extinguishers are marked with stickers, or holes punched in the servicing labels. They also have unusually large discharge horns, and no pressure gauges.
Of course if you don't have access to a CO2 fire extinguisher, try getting some dry-ice at your local grocery store. This will work just as well (and a lot cheaper) than getting it any other way.