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A quick google shows that natural gas is generally capitalised whereas the rule for chemical elements seems to be that they are not. I am writing a text that includes Natural Gas (I cannot replace that with methane) and chemical elements such as helium. I find it odd to capitalise Natural Gas and not helium.
What is the correct way to spell Natural Gas?
Wikipedia writes it in lower-case.
All the dictionaries I have searched write it in lower-case.
(That would be Merriam-Webster, dictionary.com, the Free Dictionary and the Collins Dictionary.)
The only cases you would write it in capital letters would be in a title or name, e.g. the Natural Gas Association.
