That force kicks a piston , which ejects a drug that has been embedded inside the capsule . The speed of the ejection and the depth it will reach can be controlled by altering the current .
The transfer mechanism then releases a new package from the magazine , and , in one motion , ejects the old empty package and replaces it with a new full one .
Gasifying coal to produce chemicals emits less carbon dioxide than does burning coal as fuel , but the process still ejects more carbon dioxide into the atmosphere than using natural gas would produce , says eric larson , a research engineer at the princeton environmental institute .