Before use one or both of the matches was lit; when the bottle broke on impact, the mixture ignited.

If the concentration is below 1.4% the air-gasoline mixture is too lean and will not ignite.

If the concentration is above 7.6% the mixture is too rich and also will not ignite.

Outside this range of air/vapor mixtures, the mixture will not ignite (unless the temperature and pressure are increased).

The mixture will automatically ignite on exposure to air.

When the mixture of fuel and oxidizer finally did ignite, the result was not a rocket, but a bomb.

One union member and three supervisors were killed April 21 when a volatile mixture of chemicals ignited in a blending tank.

A mixture of hydrogen gas and oxygen gas does not spontaneously ignite.

In operation, fuel would be mixed with the compressed air and the resulting mixture ignited, creating thrust.

Had any one of these elements not been present, the mixture might not have ignited.