Conical Glassco flat bottom flask, 100 ml

There are several types of laboratory flasks, all of which have different functions within the laboratory. Flasks, because of their use, can be divided into: Reaction flasks, which are usually spherical (i.e. round-bottom flask) and are accompanied by their necks, at the ends of which are ground glass joints to quickly and tightly connect to the rest of the apparatus (such as a reflux condenser or dropping funnel). The reaction flask is usually made of thick glass and can tolerate large pressure differences, with the result that one can be kept both in a reaction under vacuum, and pressure, sometimes simultaneously. Some varieties are: Multiple neck flasks, which can have two to five, and less commonly, six necks, each topped by ground glass connections which are used in more complex reactions that require the controlled mixing of multiple reagents. Schlenk flask, which is a spherical flask with a ground glass opening and a hose outlet and a vacuum stopcock. The tap makes it easy to connect the flask to a vacuum-nitrogen line through the hose and to facilitate the carrying out of a reaction either in vacuum or in an atmosphere of nitrogen. Distillation flasks are intended to contain mixtures that are subject to distillation, as well as to receive the products of distillation. Distillation flasks are available in various shapes. Similar to the reaction flasks, the distillation flasks usually have only one narrow neck and a ground glass joint and are made of thinner glass than the reaction flask, so that they are easier to heat. They are sometimes spherical, test tube shaped or pear-shaped, also known as Kjeldahl Flasks, due to their use with Kjeldahl bulbs. Reagent flasks are usually flat-bottomed flasks, which can thus be conveniently placed on the table or in a cabinet. These flasks cannot withstand too much pressure or temperature differences, due to the stresses which arise in a flat bottom; these flasks are usually made of weaker glass than reaction flasks. Certain types of flasks are supplied with a ground glass stopper in them, and others that have threaded necks close with an appropriate nut or automatic dispenser. These flasks are available in two standard shapes: Round-bottom flasks are shaped like a tube emerging from the top of a sphere. The flasks are often long neck; sometimes they have the incision on the neck, which precisely defines the volume of flask. They can be used in distillations, or in the heating a product. These types of flask are alternatively called Florence flasks. Flasks with flat bottom. Cassia flasks, for the analysis of essential oils and aldehyde determination, approx. 100 ml, neck graduated 0 - 6 : 0,1 ml. Erlenmeyer flask [introduced in 1861 by German chemist Emil Erlenmeyer (1825–1909)] - is shaped like a cone, usually completed by the ground joint, the conical flasks are very popular because of their low price (they are easy to manufacture) and portability Volumetric flask is used for preparing liquids with volumes of high precision. It is a flask with an approximately pear-shaped body and a long neck with a circumferential fill line. Dewar flask is a double-walled flask having a near-vacuum between the two walls. These come in a variety of shapes and sizes; some are large and tube-like, others \ Beaker (glassware)