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Science Lab Equipment Identification Lab. Erlenmeyer Flask.
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Science Lab Equipment Identification Lab
Erlenmeyer Flask • An Erlenmeyer flask (also known as a conical flask) is a type of laboratory glassware which consists of an inverted conical base with a cylindrical neck. The main advantages in an Erlenmeyer flask are that it is less likely to tip over than a Florence flask and the smaller neck slows evaporative loss better than a beaker. It can also be swirled without fear of the contents spilling. It is named after the German chemist Richard Erlenmeyer. The conical flask's counterpart is the beaker. However the main difference is that conical flasks may be stoppered using rubber bungs, so as the contents of the flask may be mixed or transported safely. The flask is not usually used when heating substances vigorously, this task usually being left to the Florence flask.
Stopper • A stopper is a truncated conical piece of rubber or cork used to close off a glass tube, piece of laboratory glassware, a winebottle or barrel and other containers with orifices. A rubber stopper is sometimes called a rubber bung, and a cork stopper is called cork. Ground glass stoppers are commonly used with laboratory glassware, mainly because of their nonreactivity.
Beaker • A beaker is a type of laboratory glassware which consists of a cylindrical cup with a notch on the top to allow for the pouring of liquids. They are about as wide as they are tall. This makes beakers very stable and easy to handle. They may be made of plastic, glass, or Pyrex®. Some beakers have graduated markings, or calibrations, to allow an easy rough measure of liquid volume. As a means to make solutions, they are probably the most used piece of laboratory glassware. Coupled with a good magnetic stirrer, they see frequent heavy use in a laboratory. Like a test tube or a boiling tube, a beaker can be placed over a burning flame (such as a Bunsen burner) to be heated.
Test Tube • A test tube (Sometimes culture tube) is a kind of laboratory glassware, composed of a fingerlike length of glass tubing, open at the top, sometimes with a rounded lip at the top, and a rounded 'U' shaped bottom. They range in size from a few centimetres to over 20 centimetres in length and from a few millimetres to several centimetres in diameter. They are designed to allow easy heating of samples, to be held in a flame, and often are made of expansion-resistant glasses, such as Pyrex. Tests tubes are often preferred above beakers when multiple small chemical or biological samples have to be handled and/or stored.
Test Tube Rack Used to store and hold test tubes in an upright position.
Test Tube Holder Used to hold test tubes, especially when heated or containing harmful chemicals.
Test Tube Brush Used to clean the insides of test tubes.
Graduated Cylinder • A graduated (Grad for short) cylinder, also referred to as a measuring cylinder, is a type of laboratory glassware that is used for measuring the volumes of liquids in a quantitative manner. The top usually has a small curled lip to allow easy pouring of liquids, and the bottom is usually anchored with a wide base, to keep the cylinder from easily tipping. The volumes of liquids graduated cylinders can handle range from a few milliliters to many liters. A graduated cylinder can be made of plastic or glass or Pyrex. Often, the largest graduated cylinders are made of plastic, making them lighter and more break resistant.
Petri Dish • A Petri dish is a shallow glass or plastic cylindrical dish that biologists use to culturemicrobes. It was named after the German bacteriologist Julius Richard Petri (1852-1921) who invented it in 1877 when working as an assistant to Robert Koch. Usually, the dish is partially filled with warm liquid agar along with a particular mix of nutrients, salts and amino acids and, optionally, antibiotics, that match the metabolic needs of the microbe being studied (technically referred to as a "selective medium"). After the agar solidifies, the dish is ready to receive a microbe-laden sample (although to grow some microbes it is often necessary to apply the sample with the hot agar). Modern Petri dishes often have rings on the lids and bases which allow them to be stacked so that they do not slide off of one another. As well as making agar plates, empty Petri dishes may be used to observe plant germination, or small animal behaviour.
Funnel • A funnel is a conically shaped pipe, employed as a device to channel liquid or fine-grained substances into containers with a small opening. The diameter of the spout of a regular kitchen funnel is about 1 /10 that of the upper bowl. The almost cylindrical tube below the conical upper part that opens into the spout can vary in length. Funnels are usually made of either stainless sheet metal or plastic, but sometimes paper funnels are used in cases where it would be difficult to adequately clean the funnel afterwards (for example, in adding motor oil to a car).
Eye Dropper/Medicine Dropper Used to mix or dispense small amounts of liquid, a drop at a time.
Microscope A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye.
Microscope Slide & Cover Slip • A microscope slide is a thin sheet of glass used to hold objects for examination under a microscope. A standard microscope slide (shown on the right) is 75 x 25 mm (3" X 1") and 1.2 mm thick. A range of other sizes is available for various special purposes. Since compound or high power microscopes have a very narrow region within which they focus, the object to be viewed ("specimen") is typically placed on the middle of the slide with another, much thinner square (or circle or rectangle) of glass placed over the specimen. This smaller sheet of glass is called a cover slip or cover glass, and typically measures between 18 and 25 mm on a side. The cover glass serves two purposes: (1) it protects the microscope's objective lens from contacting the specimen, and (2) it creates an even thickness (in wet mounts) for viewing.
Hand Lens/Magnifying Glass • A magnifying glass is a single convexlens which is used to produce a magnifiedimage of an object. The lens is usually mounted in a frame with a handle. The magnifying glass is the simplest form of optical microscope. A magnifying glass works by creating a magnified virtual image of an object behind the lens. The distance between the lens and the object must be shorter than the focal length of the lens for this to occur. A lens is a device for either concentrating or diverging light, usually formed from a piece of shaped glass.
Triple Beam Balance • A balance (also balance scale, beam balance or laboratory balance) is used to accurately measure the mass of an object. This class of measuring instrument uses a comparison technique in its conventional form of a beam from which a weighing pan (weighing bason) and scale pan (scale bason) are suspended. To weigh an object, it is placed on the measuring pan, and standard weights are added to the scale pan until the beam is in equilibrium.
Tongs • Tongs are gripping and lifting tools, of which there are many forms adapted to their specific use.
Safety Goggles • Goggles or safety glasses are a form of protective eyewear that usually enclose the eye area to prevent particulates or chemicals from striking the eyes. They are used in chemistry laboratories and in woodworking
Thermometer • A thermometer is a device used to measure temperatures or temperature changes.
Hot Plate • A hot plate is a small electric stove often used in a laboratory setting to heat glassware. Some hotplates also contain a magnetic stirrer, allowing the heated liquid to be stirred simultaneously. Hot plates are also used in food preparation, generally for small dishes in places where a full kitchen stove would not be convenient.
Scalpel • A scalpel is a very sharp knife used for surgery as well as various arts and crafts. Scalpels can have a fixed blade, or a disposable blade. The blades on scalpels are extremely sharp—merely touching a medical scalpel with bare hands to test it will cut through the skin. The handles of medical and dissection scalpels are flatter, more like a bread knife. They do not have the same level of grip as art scalpels, as this would make cleaning and sterilization more difficult. The grip in medical scalpels is usually just a slight corrugation.
Forceps • Forceps are a hand-held instrument for grasping and holding objects, similar in concept to tongs, tweezers or pincers. They have a locking mechanism to ensure they do not squeeze too tightly onto the object they are used upon.
Dissecting Pins Used to hold objects in place during dissection.
Probe • Probe is a generic term used to refer to a device used to gather information.
Bunsen Burner • A Bunsen burner is a device used in scientific laboratories for heating, sterilization, and many other uses. There is a misconception that the inventor is Robert Wilhelm Bunsen but it is only named after him, whose laboratory assistant, Peter Desdega, in 1855 perfected an earlier design by Michael Faraday. The device safely burns a continuous stream of gas without the risk that the flame will travel back down the tube to the gas supply. It is most common for the burner today to run on natural gas. The burner has a weighted base, where the gas supply attaches, and a vertical tube rising from it. The gas flows from the gas supply connection to the base. The stream of gas then passes through a small hole at the bottom of the tube and is directed upward through the tube. There are perforations in the side of the tube at the bottom to admit air into the stream (via the venturi effect and the gas burns at the top of the tube, once it is ignited. The in-flow of gas and thus the heat of the flame can be controlled by adjusting the size of the holes at the base of the tube.
