Gas bubblers are used to exclude air from a reaction or a system by acting as a one-way valve. Gases from the inlet bubble through a fluid (oil, mercury, or water) before they are vented to the atmosphere. As the gas from the reaction builds in pressure, vapors bubble through the bulb. The atmosphere in the outlet remains at the same pressure, however, and does not bubble. The reaction gas is thus able to escape while the atmospheric gas is prevented from getting to the reaction.
Gas bubblers are used in laboratory and educational applications to prevent atmosphere / moisture from reaching a reaction that needs to vent gas. Product categories include mini, reaction vessel, in-lie, reverse flow, oil, check valve, safety, mercury, and mineral oil bubblers. When selecting products, buyers should consider hose connections and can choose products with a ground glass inlet and outlet.