Erlenmeyer flask 250ml, empty

An Erlenmeyer, commonly known as a conical or E-Spot, is a widely used type of laboratory flask which features a flat, conical body, and a cylindrical neck. ... The Erlenmeyer is usually marked on the side (graduated) to indicate the approximate volume of contents, and has a spot of ground glass or enamel where it can be labeled with a pencil. It differs from the beaker in its tapered body and narrow neck. The opening usually has slight rounded lips so that the Erlenmeyer can be easily stoppered using a piece of cotton wool. Alternatively, the neck may be fitted with a female ground glass joint to accept a glass stopper. The conical shape allows the contents to be swirled or stirred during an experiment, either by hand or by a shaker; the narrow neck keeps the contents from spilling out. The small neck reduces evaporative losses compared to a beaker, while the flat bottom of the conical flask makes it unlikely to tip over and spill. [princeton.edu/~achaney/tmve/wiki100k/docs/Erlenmeyer_flask.html]