The third category covers gas produced by particularly expensive methods, such as that gas obtained from between layers of more impervious rock.

Renewable natural gas is defined as gas obtained from biomass which is upgraded to a quality similar to natural gas.

That is, the gas density is found by measuring the volume of gas obtained from a known mass of the liquid.

This is measured at room temperature and equals the volume of gas obtained from the known mass of liquid in the Hofmann bottle.

Q.I can understand how to collect hydrogen and oxygen by electrolyzing water, but how are rare gases obtained?

It would be the first such unit built in the northeastern United States utilizing natural gas obtained from hydraulic fracturing as feedstock.

What is more, we have recently seen a marked rise in the price of gas obtained from conventional sources.

Until the automation the lighthouse was lit by incandescent gas obtained from vaporised paraffin oil converted into a bunsen gas for heating a mantle.

It was intended to generate electricity from natural gas obtained from offshore production fields.