Assertion: bunsen burner's air hole | /r/HasProperty | roaring blue flame)the device
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text: 2. air hole half open 3. air hole nearly fully open 4. air hole fully open (Roaring Blue Flame)The device in use today safely burns a continuous stream of a flammable gas such as natural gas (which is principally methane) or a liquefied petroleum gas such as propane, butane, or a mixture of both.