Dry ice bomb

Dry ice bomb exploding in water.

A dry ice bomb is a simple bomb-like 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.

Overview

Dry ice bombs are commonly made from a container such as a plastic bottle, water, and dry ice. The bottle is filled about one 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.^[1] A dry ice bomb may develop a frost on the bottle exterior prior to explosion.^[1] After explosion, a dry ice bomb will appear to have shattered, with the overall shape of the device intact.^[1]

Dangers

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 have 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. Injuries are common, with glass bottles in particular posing a risk of serious injury or death.^[2][3][4][5]

Legality

Dry ice bombs are illegal in many jurisdictions,^[6][7] and can lead to imprisonment.^[8]

• 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".^[9][10]
• In Nebraska^[11] 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,^[12] as well as their possession by "prohibited possessors" such as convicted felons and illegal immigrants.^[13]
• In Utah simple possession of a dry ice bomb or similar pressurized chemical reaction bombs is a second-degree felony.^[14]
• In Colorado, the creation of a dry ice bomb is considered illegal due to interpretation as "possession of an explosive device"
• Leaving an unexploded dry ice bomb can be construed as public endangerment.
• Exploding a dry ice bomb in the state of Pennsylvania in public can result in criminal charges, as it was not done in an open area such as a bomb range or gun range.

In popular culture

• A dry ice bomb was featured on MythBusters, in episode 57 Mentos and Soda, which was first aired on August 9, 2006, and again in the "Do Try This At Home" Special, which also demonstrated bending of a metal frame and serious damage to dummy rubber/bone forearms.
• 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.
• In the game Nine Hours, Nine Persons, Nine Doors, the main characters use a dry ice bomb to escape a freezer.
• A dry ice bomb was used by the main characters in Archer, in S02E04 in an attempt to deter an alligator but instead almost causing an accident.

See also

• Spud gun
• Diet Coke and Mentos eruption
• Chlorine bomb
• Rapid phase transition

References

External links

• DryIceNetwork.com – Dry ice information source
• USENET pyrotechnics FAQ
• Mad Physics :: Dry Ice Explosions