A dry ice bomb is a simple bomb-like improvised explosive device. While the simplicity and ease of construction, high bursting pressure, and sound make this dry ice activity appealing for recreational purposes, it can be unpredictable and dangerous, and has led to many injuries - and dry ice bombs are illegal in many jurisdictions.
Dry ice bombs are commonly made from a container such as a plastic bottle, water, and dry ice. The bottle is filled about quarter full of water. Some broken chunks of dry ice are added and the container is shut tightly. As the solid carbon dioxide warms inside a bottle, it sublimates to a gas. The pressure inside the bottle increases as the quantity of gas increases with limited room to expand. Bombs will typically rupture within 30 seconds to 30 minutes, dependent largely on the temperature of the air outside the bottle. A dry ice bomb may develop a frost on the bottle exterior prior to explosion. After explosion, a dry ice bomb will appear to have shattered, with the overall shape of the device intact.
Dry ice bombs have some serious risks:
Premature explosion. Burst pressure can occur within seconds, injuring the handler.
Dry ice is very cold: −78.5 °C (−109.3 °F). The explosion can carry shards of dry ice that had not sublimed.
The shock wave can be extremely loud and hearing damage can occur even at substantial distances.
The blast can propel fragments of the container at very high speeds causing cuts and puncture wounds.
Added shrapnel such as nails, marbles, and metal fragments can cause blunt force trauma to the body.
Dud bombs which fail to explode are a major safety problem. They cannot be left, yet cannot be safely approached. Unexploded bombs can be shot or otherwise ruptured from a safe distance. Injuries are common, with glass bottles in particular posing a risk of serious injury or death.
The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page.(May 2012)
Dry ice bombs are illegal in some jurisdictions in the United States, and can lead to imprisonment.
A law in California that defines "destructive device" includes a list of "weapons" including "[any] sealed device containing dry ice (CO2) or other chemically reactive substances assembled for the purpose of causing an explosion by a chemical reaction".
Two dry ice bombs went off in the Los Angeles International Airport on October 15, 2013. A disgruntled airport employee was arrested in connection with the blast. The police did not treat the incident as an act of terrorism.
A dry ice bomb went off in the Toontown section of Disneyland in Anaheim, California on May 28, 2013, resulting in the evacuation of Toontown but causing no injuries. A Disneyland employee was arrested in connection with the blast.
In Nebraska and in other areas the noise generated may violate local laws.
Arizona prohibits dry ice bombs if there is an intent to cause injury, death, or damage to the property of another, as well as their possession by "prohibited possessors" such as convicted felons and illegal immigrants.
An episode of Discovery channel's Time Warp features several dry ice bombs filmed on high speed camera; one on a tabletop and three in a metal tank with a transparent front. The cast believed that once one of the three bombs exploded it would blow up the other two bombs; the first bomb exploded rupturing the tank without exploding the other two 2-liter bottle bombs, and the cast and crew had to run and seek cover.