( Article) They are typically very cost-effective and do not require an oxygen source other than the ambient air.

"The notion was that many of these common pollutants were poisoning our food and oxygen sources," she said.

They are typically cost-effective and do not require an oxygen source other than the ambient air to produce ozone concentrations of 3-6%.

Once the doors are closed, the fire loses its oxygen source.

The detector man had found no oxygen source except the launch.

A promising group of oxygen sources are ozonides.

But when that oxygen source failed, he couldn't be sure whether Susan had received enough of the deadly gas for his purposes.

Other advantages include its ability to function without an external oxygen source, allowing it to burn underwater.

"The room can include an oxygen source such as an oxygen generator," she adds.

Sometimes the oxygen source is the fuel itself.