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Beaker (laboratory Equipment)
In laboratory equipment, a beaker is generally a cylindrical container with a flat bottom.Oxford English Dictionary 1989 edition Most also have a small spout (or "beak") to aid pouring, as shown in the picture. Beakers are available in a wide range of sizes, from one milliliter up to several liters. A beaker is distinguished from a flask by having straight rather than sloping sides. The exception to this definition is a slightly conical-sided beaker called a Philips beaker. The beaker shape in general drinkware is similar. Beakers are commonly made of glass (today usually borosilicate glass), but can also be in metal (such as stainless steel or aluminum) or certain plastics (notably polythene, polypropylene, PTFE). A common use for polypropylene beakers is gamma spectral analysis of liquid and solid samples. Construction and use Standard or "low-form" (A) beakers typically have a height about 1.4 times the diameter.British Standard 6523 (1984) ''Glass beakers for original e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laboratory Flask
Laboratory flasks are vessels or containers that fall into the category of laboratory equipment known as glassware. In laboratory and other scientific settings, they are usually referred to simply as flasks. Flasks come in a number of shapes and a wide range of sizes, but a common distinguishing aspect in their shapes is a wider vessel "body" and one (or sometimes more) narrower tubular sections at the top called necks which have an opening at the top. Laboratory flask sizes are specified by the volume they can hold, typically in metric units such as milliliters (mL or ml) or liters (L or l). Laboratory flasks have traditionally been made of glass, but can also be made of plastic. At the opening(s) at top of the neck of some glass flasks such as round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer (or female) tapered (conical) ground glass joints. Some flasks, especially volumetric flasks, come with a laboratory rubber stopper, bung, or cap for capp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Titration
Titration (also known as titrimetry and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the ''titrant'' or ''titrator'', is prepared as a standard solution of known concentration and volume. The titrant reacts with a solution of ''analyte'' (which may also be termed the ''titrand'') to determine the analyte's concentration. The volume of titrant that reacted with the analyte is termed the ''titration volume''. History and etymology The word "titration" descends from the French word ''titrer'' (1543), meaning the proportion of gold or silver in coins or in works of gold or silver; i.e., a measure of fineness or purity. ''Tiltre'' became ''titre'', which thus came to mean the "fineness of alloyed gold", and then the "concentration of a substance in a given sample". In 1828, the French chemist Joseph Louis Gay-Lussac first used ''titre'' as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASTM
ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. Some 12,575 ASTM voluntary consensus standards operate globally. The organization's headquarters is in West Conshohocken, Pennsylvania, about northwest of Philadelphia. It is founded in 1902 as the American Section of the International Association for Testing Materials (see also International Organization for Standardization). History A group of scientists and engineers, led by Charles Dudley, formed ASTM in 1898 to address the frequent rail breaks affecting the fast-growing railroad industry. The group developed a standard for the steel used to fabricate rails. Originally called the "American Society for Testing Materials" in 1902, it became the "American Society for Testing And Materials" in 1961. In 2001, ASTM offic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scoop (utensil)
In common usage, a scoop is any specialized spoon used to serve food. In the technical terms used by the food service industry and in the retail and wholesale food utensil industries, there is a clear distinction between three types of scoop: the disher, which is used to measure a portion e.g. cookie dough, to make melon balls, and often to serve ice cream (although manufacturers frequently advise against using dishers for ice cream and other frozen foods); ice cream scoops, and the scoop which is used to measure or to transfer an unspecified amount of a bulk dry foodstuff such as rice, flour, or sugar. Disher Dishers are usually hemispherical like an ice cream scoop, while measuring scoops are usually cylindrical, and transfer scoops are usually shovel-shaped. Some dishers have mechanical levers which help expel the disher's contents. Traditionally dishers are sized by the number of scoops per quart but may also be sized by ounces, the diameter of the bowl, or the number ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graduated Cylinder
A graduated cylinder, also known as a measuring cylinder or mixing cylinder, is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured. Materials and structure Large graduated cylinders are usually made of polypropylene for its excellent chemical resistance or polymethylpentene for its transparency, making them lighter and less fragile than glass. Polypropylene (PP) is easy to repeatedly autoclave; however, autoclaving in excess of about (depending on the chemical formulation: typical commercial grade polypropylene melts in excess of ), can warp or damage polypropylene graduated cylinders, affecting accuracy. A traditional graduated cylinder is usually narrow and tall so as to increase the accuracy and precision of volume measurement. It has a plastic or glass base (stand, foot, support) and a "spout" for easy pouring o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Test Tube
A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks. Types and usage Chemistry Test tubes intended for general chemical work are usually made of glass, for its relative resistance to heat. Tubes made from expansion-resistant glasses, mostly borosilicate glass or fused quartz, can withstand high temperatures up to several hundred degrees Celsius. Chemistry tubes are available in a multitude of lengths and widths, typically from 10 to 20 mm wide and 50 to 200 mm long. The top often features a flared lip to aid pouring out the contents. A chemistry test tube typically has a flat bottom, a round bottom, or a conical bottom. Some test tubes are made to accept a ground glass stopper or a screw cap. They are often provided with a small ground glass or wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stirring Rod
A glass stirring rod, glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends. Structure Stir rods are generally made of borosilicate (commonly known as Pyrex) glass or polypropylene plastic. They are usually between 10 and 40 centimeters in length and about half a centimeter in diameter. Glass rods are created from a single length of thin glass that is then cut into smaller segments. The ends are generally rounded (for example, by flame polishing) to prevent scratching the surface of glassware during use, which may lead to cracks if the glassware is later heated. Other shapes are possible, such as a flat paddle which can be used to circulate sediment, a triangular paddle to imitate a rubber policeman or a round button used to crush solids. Uses A stirring rod is used for mixing liquids, or solids and liquids. Stir rod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volumetric Flask
A volumetric flask (measuring flask or graduated flask) is a piece of laboratory apparatus, a type of laboratory flask, calibrated to contain a precise volume at a certain temperature. Volumetric flasks are used for precise dilutions and preparation of standard solutions. These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking. The marking indicates the volume of liquid contained when filled up to that point. The marking is typically calibrated "to contain" (marked "TC" or "IN") at 20 °C and indicated correspondingly on a label. The flask's label also indicates the nominal volume, tolerance, precision class, relevant manufacturing standard and the manufacturer's logo. Volumetric flasks are of various sizes, containing f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaker (other)
Beaker may refer to: Containers * Beaker (drinkware), a beverage container * Beaker (laboratory equipment), a glass container used for holding liquids in a laboratory setting * Beaker (archaeology), a prehistoric drinking vessel * Beaker culture, the archaeological culture often called the Beaker people * Sippy cup, referred to as a beaker in UK English Other * Beaker (Muppet), the hapless assistant of Dr. Bunsen Honeydew on ''The Muppet Show'' * Beaker (web browser) Beaker is a discontinued free and open-source web browser developed by Blue Link Labs. Beaker Browser peer-to-peer technology allows users to self-publish websites and web apps directly from the browser, without the need to set up and administrat ..., a peer-to-peer browser with tools to create and host websites. * '' Beaker Street with Clyde Clifford'', underground music program 1967–2011 hosted by Clyde Clifford * Norman Beaker, British guitarist * Tracy Beaker, a fictional character See also * Beker_(d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaker (archaeology)
In archaeology, a beaker is a small round ceramic or metal drinking vessel shaped to be held in the hands. It has no handle or spout. Term Archaeologists identify several different types including the inverted-bell beaker, the butt beaker, the claw beaker, and the rough-cast beaker. When used alone “beaker” usually refers to the typical form of pottery cups called ''inverted-bell beakers'' associated with the European Beaker culture of the late Neolithic and early Bronze Age. Bell beakers The '' inverted-bell beaker'' or ''bell-beaker'' was first defined as a find-type by Lord Abercromby in the early twentieth century and comes in three distinct forms, the (typical) bell beaker, and the rarer short-necked beaker, and long-necked beaker. There are many variations on these basic types, with inter-grades between them. Bell-beakers have been found from North Africa to southern Scotland and from Portugal to the far east of Europe, but are particularly common in the Rhine va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaker (drinkware)
A beaker is a beverage container, typically of non-disposable plastic, or a ceramic cup or mug without a handle, much like a laboratory beaker. The term ''beaker'' is used in parts of the United Kingdom, and particularly commonly to refer to a lidded cup designed for toddlers or small children, with a no-spill mouthpiece incorporated into the lid. In North American English, the term is used almost exclusively in the laboratory context, whereas the drinking vessels are referred to as '' tumblers''. See also * Beaker (archaeology) In archaeology, a beaker is a small round ceramic or metal drinking vessel shaped to be held in the hands. It has no handle or spout. Term Archaeologists identify several different types including the inverted-bell beaker, the butt beaker, t ... * Beaker (other) * Häufebecher Drinkware {{drinkware-stub br:Gob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volumetric Flask
A volumetric flask (measuring flask or graduated flask) is a piece of laboratory apparatus, a type of laboratory flask, calibrated to contain a precise volume at a certain temperature. Volumetric flasks are used for precise dilutions and preparation of standard solutions. These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking. The marking indicates the volume of liquid contained when filled up to that point. The marking is typically calibrated "to contain" (marked "TC" or "IN") at 20 °C and indicated correspondingly on a label. The flask's label also indicates the nominal volume, tolerance, precision class, relevant manufacturing standard and the manufacturer's logo. Volumetric flasks are of various sizes, containing f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
