| In the 1970s, the United States, along with several other countries, banned the use of CFCs as aerosol propellants. |
| And we'll be doing some testing, including small-scale weapons testing, just to see how these propellants react in a gun environment. |
| Of course, the scanner could only detect metals, energy sources and chemical compounds that could be combined into propellants and explosives. |
| Liquid helium from a tank in the lunar module was used to assure a steady flow of propellants to the descent engine. |
| Smokeless propellants are expensive and not often used in making fireworks. |
| Aerosol propellants contain flammable and nerve-damaging ingredients as well as tiny particles that can lodge in your lungs. |
