You know what it looks like… but what is it called?
TAKE THE QUIZ“Blau”
We have one entry that includes the term Blau.
blau gas
noun: an oil gas consisting chiefly of a mixture of lower saturated and unsaturated hydrocarbons supplied in liquid form under pressure and used especially formerly for heating and lighting and as a motor fuel —distinguished from blue gas
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Merriam-Webster unabridged