The alka-seltzer tablet has a chemical reaction when in contact with water it will fizz up releasing gasses. If the alka-seltzer is in a container and the add water then the gasses will build up until the container will burst releasing all the gasses if in a small container then you’ll get a little rocket
When the alka saltzer rockets were made. We dropped a tablet into the water. Depending on the temperature of the water, it sped up or slowed down the chemical reactions. When the water was boiling or hot, it only took a few seconds to burst, but when the water was cold it took around a minute.
-Calvin 8 w