Characteristics of Natural Gas Practice Test 2026 – The Comprehensive Guide to Mastering Your Exam!

When there isn’t enough gas reaching the appliance, the pressure at the appliance is too low—this is under-pressurization. Appliances require a minimum flow and pressure to push gas through the line and into the burner. If the pressure falls below that minimum, gas can’t reach the burner, so there’s no flame or a very weak flame. This is different from over pressure (too high pressure that safety devices respond to), normal pressure (adequate pressure and a functioning flame), or intermittent flow (gas comes and goes rather than being consistently low).