🟥SUBJECT: SCBA CYLINDER REFILL FROM WARM TO COLD I received a QUESTION & it is a good one: Do I need to refill if the vessel is from a warm area, then going to a cold area? Because my SCBA pressure gauge dropped to 190bars (5%) from 200bars? What you are observing is normal pressure drop due to temperature change. SCBA cylinders follow Gay-Lussac's Law to be more precise: When temperature decreases → internal pressure decreases. When temperature increases → internal pressure increases. So, if y