1.   Since a gas assumes the shape of its container, a gas cannot have a fixed volume.

2.   After mixing the gases have a higher state of disorder than before mixing.

3.   Both told of geologic fumes that inspired divine frenzies, with Plutarch noting that the gases had a sweet smell.

4.   Each gas has a different warming potency and a different lifetime in the atmosphere.

5.   Gas drilling can have serious environmental effects, said Dennis Tighe, a Great Falls lawyer who is a former president of the Montana Wilderness Association.

6.   Gas has trouble getting to New England because the pipeline system forces it to travel so far from Canada or down south.

7.   Gas has several attractive qualities.

8.   Gas will have less sulfur, so catalytic converters can work better.

9.   In addition, the smallest molecules tend to evaporate easily, which also adds to air pollution, so the new gas will have fewer of those.

10.   Moreover, gas now has cachet as a green fuel.