Dry ice
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. Chunks of dry ice are added and the container is to be shut tightly. As the solid carbon dioxide warms, it sublimates to gas. With limited room for the gas to expand, the pressure in the bottle increases. Bombs 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 frost on its exterior prior to explosion. After explosion, it appears to have shattered, with the overall shape of the device intact.