- Oil bubbler
An oil bubbler is a piece of
laboratory glasswarewhich consists of a glass bulb filled with a small amount of silicone oil. The inlet to the bulb is connected to a ground glass joint, while the outlet is vented to the air.
Oil bubblers are used to exclude air from a reaction or a system. In the former case, the oil bubbler is fitted on the
condenserof the reaction set-up. In the latter case, an oil bubbler is usually installed at the end of the inert gasmanifold on a Schlenk lineto prevent contamination by atmospheric oxygenand water.
The oil bubbler acts as a one-way valve - gases (hot air, evolved gases, solvent vapors) from the inlet will bubble through the oil before being vented to the atmosphere. On the other hand, if there were an underpressure in the reaction vessel (such as when heat is removed, and the gases within contract), oil is sucked into a sump to equalize the pressure, instead of air. Wherever possible, such "suck back" should be avoided by filling the reaction apparatus with inert gas because an excessively low pressure will cause oil to be sucked into the reaction vessel, contaminating it.
Mercury bubblers are similar to oil bubblers. The high density of mercury increases the pressure of the gas flowing through the line, since more force is required for the gas to bubble through such a dense material. However, due to the mercury's toxicity, and the risk of releasing large quantities of mercury if the bubbler were to be broken or sucked back into the gas line, the use of mercury bubblers is generally discouraged. In addition, mercury can react with various chemicals, such as ammonia and acetylenes, with potentially hazardous results [http://www.jtbaker.com/msds/englishhtml/M1599.htm] . Oil bubblers are usually adequate substitutes.Fact|date=June 2007
drying tubeis used to exclude moisture from reactions for less demanding applications
Wikimedia Foundation. 2010.
Look at other dictionaries:
Gas bubbler — A simple gas bubbler containing silicone oil An gas bubbler is a piece of laboratory glassware which consists of a glass bulb filled with a small amount of fluid usually mineral or silicone oil, less commonly mercury. The inlet to the bulb is… … Wikipedia
Drying tube — A variety of empty glass drying tubes. When used, they are packed with a desiccant, usually calcium chloride. A drying tube or guard tube is a tube like piece of apparatus used to house a disposable solid desiccant, wherein at one end the tube… … Wikipedia
Schlenk line — A Schlenk line with four ports. The cold trap is on the right … Wikipedia
Laboratory glassware — Three beakers, a conical flask, a graduated cylinder and a volumetric flask … Wikipedia
Ground glass joint — Ground glass joints are used in laboratories to quickly and easily fit leak tight apparatus together from commonly available parts. For example, a round bottom flask, Liebig condenser, and oil bubbler with ground glass joints may be rapidly… … Wikipedia
Level sensor — Level sensors are used to detect liquid level. The liquid to be measured can be inside a container or can be in its natural form (e.g. a river or a lake). The level measurement can be either continuous or point values. Continuous level sensors… … Wikipedia
Chernobyl disaster — This article is about the 1986 nuclear plant accident in Ukraine. For other uses, see Chernobyl (disambiguation). Chernobyl disaster … Wikipedia
List of Donkey Kong characters — From left to right: Diddy Kong, Donkey Kong, Dixie Kong, Funky Kong, Cranky Kong, Wrinkly Kong and Swanky Kong. The following is a list of characters featured in the Donkey Kong series of video games made by both Rare and Nintendo as well as the… … Wikipedia
Regional vocabularies of American English — vary. Below is a list of lexical differences in vocabulary that are generally associated with a region. A term featured on a list may or may not be found throughout the region concerned, and may or may be not recognized by speakers outside of… … Wikipedia
Hashish — (from Arabic: ar. حشيش ArabDIN|ḥashīsh , lit. grass ; also hash) is a preparation of cannabis composed of the compressed trichomes collected from the cannabis plant. It contains the same active ingredients but in higher concentrations than other… … Wikipedia