a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation) | a pedal that controls the throttle valve |
| the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container |
| a state of excessive gas in the alimentary canal |
| a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
| a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines |
| a fossil fuel in the gaseous state; used for cooking and heating homes |