出典:Wiktionary
graduated cylinder (複数形 graduated cylinders)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/03 05:03 UTC 版)
A graduated cylinder, measuring cylinder or graduate is a piece of laboratory equipment used to accurately measure the volume of a liquid. Water displacement can be used to find out the volume of a solid. Graduated cylinders are generally more accurate and precise for this purpose than flasks and beakers. Often, the largest graduated cylinders are made of polypropylene for its excellent chemical resistance or polymethylpentene for its transparency, making them lighter and less fragile than glass. Polypropylene is easy to repeatedly autoclave; however, autoclaving in excess of about 130 °C (266 °F) (depending on the chemical formulation: typical commercial grade polypropylene melts in excess of 160 °C (320 °F)),can warp or damage polypropylene graduated cylinders, affecting accuracy.