Even though there may be no visible flames, a fire can smolder beneath the ground for weeks.

He looked away to the flames still visible inside the Mall and sighed.

There was no visible flame of energy, only that glow at the metal source.

A visible flame may momentarily shoot out of the exhaust pipe.

There were few flames visible now, and most of the smoke had cleared.

For example, it burns without producing visible flames, and so is usually blended with gasoline as a safety measure.

These bonds also cause propane to burn with a visible flame.

The sun was hovering above the horizon, visible in dazzling red flame through the black stems of the trees.

This may give either a visible flame or an audible sound.