Many measuring methods have been described in the literature but only a few of them have been found to be widely applicable. Cohesion of water Have you ever filled a glass of water to the very top and then slowly added a few more drops? This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". coincides with the bottom of the curved surface of the liquid. Concave Meniscus (See diagram A) The curved upper the surface of a column of liquid inside a container. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Effect of dynamic contact angle on capillary rise phenomena. How to Read a Meniscus - Science Notes and Projects 1 : a crescent or crescent-shaped body. It was observed that this constant term varies as a function of the liquid used, in contradiction with the Washburn approach which uses Hexane as a completely wetting liquid in order to find the radius of the pores. Your email address will not be published. 4 : a fibrous cartilage within a joint especially of the knee. Concave menisci are read from the foot of the bend at eye level. The molecules of the fluid exhibit an affinity towards the molecules present in the wall of the glass beaker. A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. (2000) suggested that for porous media the term rcos() for each alkane (the term was calculated from Washburn equation) can be ploted against the initial front rate of each liquid. Comment document.getElementById("comment").setAttribute( "id", "a98c5edd4f673b9e27904649e54e407a" );document.getElementById("ae49f29f56").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Instead, the top is curved inward, making it a little difficult to decide exactly where to read the volume. This cookie is set by GDPR Cookie Consent plugin. A convex meniscus occurs, for example, between Mercury and glass in barometers and thermometers. Adhesion forces between the fluid and the solid inner wall pull the liquid column up until there is a sufficient mass of liquid for gravitational forces to counteract these forces. A. A healthy knee joint contains two C-shaped cartilage like structures, each one called a meniscus. Wetting refers to the study of how a liquid deposited on a solid (or liquid) substrate spreads out or the ability of liquids to form boundary surfaces with solid states. However, before we explain why some liquid possess a concave up meniscus while some share a concave lower meniscus, we must comprehend the adhesive forces at the office of surface tension. Which of the following describes why water has a concave or downward curving meniscus? . The cookie is used to store the user consent for the cookies in the category "Performance". The short answer: Take your measurement from the center of the meniscus. Definition of meniscus 1 : a crescent or crescent-shaped body. Meniscus tears are common knee injuries. Sign up to get free delivery for orders over $100. The contact angle is obtained directly form the height trough: \[ \sin ( \theta) = 1 - \rho g h^2 / 2 \gamma \label{3} \]. How To Become A Chemical Engineer In Bitlife? Change ). You might develop the following signs and symptoms in your knee: If the meniscus is convex, take your measurement at the highest point of the curve. There are a couple of reasons why your knee pain is worse at night: Pain is perceived to be worse at nighttime. This lead to Young and Dupre equation which introduces the reversible work of adhesion of liquid and solid and its relation to the surface tension between liquid and vapor phases and the contact angle: \[ W_{sl}^{adh} = \gamma_{lv} (1 + \cos \theta) \label{2}\]. To measure the volume of liquid in a graduated cylinder, you should make a reading at the bottom of the meniscus, the lowest point on the curved surface of the liquid. These cohesive forces are especially strong at the surface of a liquid, resulting in the phenomenon of surface tension. The meniscus plays a vital role in maintaining the stability of the knee joint along with optimizing the tibiofemoral load transfer and distribution. line. Required fields are marked *. The curved When observing a volume of a liquid in a graduated cylinder, graduated pipette, or buret, read the point on the graduated scale that coincides with the bottom of the curved surface of the liquid. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 161, 81-87. These cookies will be stored in your browser only with your consent. The Different Meanings of Meniscus in Science. Before it overflows, the water forms a dome-like shape above the rim of the glass. The contact angle is an angle that a liquid creates with a solid surface or capillary walls of a porous material when both materials come in contact together. What are the two reasons the meniscus are important? 2023 Westlab Group Ltd. All rights reserved. com : A concave the surface of a liquid caused by surface tension. What is a meniscus in a graduated cylinder? [Answered!] Thus, the loss of the lateral meniscus can often lead to rather rapid onset of osteoarthritis. The nature of curve whether upward (convex) or downward (concave) depends on the surface tension the liquid and its adhesion capacity to the wall of the container. If yes, then this guide , Spread the loveForensic science is a complex field that involves the use of various analytical techniques to solve crimes. The capillary rise on a Wilhelmy plate is a good way to obtain the contact angle by measuring the height of the meniscus created on a partially immersed plate. The meniscus may be the curvature of the liquids surface inside a container, like a graduated cylinder. Is Chemistry Or Physics Harder? By clicking Accept, you consent to the use of ALL the cookies. roughness), a low contact angle with water means that the surface is hydrophilic. Home. Parallax errors: This type of error occurs when the scale of the buret is not viewed from a perpendicular position. Science, Tech, Math Science Math Social Sciences . He also shares personal stories and insights from his own journey as a scientist and researcher. The foot of the meniscus can be used to determine the level of a liquid in apparatus like a graduated cylinder. The store will not work correctly in the case when cookies are disabled. You must be at eye level with the bottom of the meniscus (curved surface of liquid) to read the burette. The nature of curve whether upward (convex) or downward (concave) depends on the surface tension the liquid and its adhesion capacity to the wall of the container. An example of data being processed may be a unique identifier stored in a cookie. It does not store any personal data. Ph.D., Biomedical Sciences, University of Tennessee at Knoxville; B.A., Physics and Mathematics, Hastings College . A meniscus is a curve at the surface of a liquid in a container. Analytical cookies are used to understand how visitors interact with the website. something sticking to itself, we call that cohesion. Why a meniscus occurs Adhesion is responsible for a meniscus and this has to do in part with water's fairly high surface tension. It does not store any personal data. A burette, also called a buret, is a long, graduated, glass tube marked with measurements and used in chemistry. Water Science School HOME Water Properties topics But opting out of some of these cookies may affect your browsing experience. borderline. When the meniscus tears that cushioning effect functions poorly, that might lead to arthritis and knee pain. Discover The Answer Now! Key Concepts and Summary. Do NOT follow this link or you will be banned from the site! Why do we need to read the lower meniscus and not the upper meniscus? When attractive forces occur between like molecules, they are referred to as cohesive forces, or resulting in cohesion, because they hold the molecules of sample close together. This curve is formed by the surface tension between the liquid and the container holding the liquid. If the meniscus is a concave meniscus, read at the lowest level of the curve. band. The surface tension arises due to cohesive interactions between the molecules in the liquid. Analytical cookies are used to understand how visitors interact with the website. What is the fastest way to recover from meniscus surgery? All Right Reserved. This cartilage is the meniscus. For example, when water is poured into a glass, it forms a concave meniscus. A meniscus can go up or down. They function as shock absorbers and force distributors that help to stabilize the knee. As pictured below, the volume should be read from the bottom of the meniscus. When liquid water is confined in a tube, its surface (meniscus) has a concave shape because water wets the surface and creeps up the side. QUIZQUIZ YOURSELF ON AFFECT VS. EFFECT! Home | About | Contact | Copyright | Report Content | Privacy | Cookie Policy | Terms & Conditions | Sitemap. Parallax error is the apparent displacement of an object as seen from two different viewpoints that are not in line with the object. The Meniscus When observing a volume of a liquid in a graduated cylinder, graduated pipette, or buret, read the point on the graduated scale that coincides with the bottom of the curved surface of the liquid. How do I determine the molecular shape of a molecule? Accessibility StatementFor more information contact us atinfo@libretexts.org. As you climb into bed and start to quiet your mind pain becomes more pronounced than when you were active during the day distracted by your activities. Discover The Answer Now! In his writing, Alexander covers a wide range of topics, from cutting-edge medical research and technology to environmental science and space exploration. On what factors does surface tension depends? And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus. In both cases, the accurate measurement is taken by reading the center of the meniscus. Home Chemistry What is a meniscus in chemistry and why is it important? The meniscus plays two important roles within the knee. Why Does Water Curve, and What is a Meniscus? - Physics Van | UIUC Copyright 2022 - sciencebriefss.com. The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. The meniscus plays two important roles inside the knee. Why Do Cross Country Runners Have Skinny Legs? The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container. Its that easy. This cookie is set by GDPR Cookie Consent plugin. The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container. What is the correct position for viewing a meniscus quizlet? Find Out Now! Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. TimesMojo is a social question-and-answer website where you can get all the answers to your questions. This error is often called a bias in the measurement. The cookie is used to store the user consent for the cookies in the category "Other. Contact angle measurements The static and dynamic sessile drop method: www.youtube.com/watch?v=5q9qOMesc88&feature=related. How capillary action and the meniscus are related to intermolecular forces in water. Responsibility disclaimer and privacy policy | About Us | Terms & Conditions | Site Map, Scientific discoveries from around the world. Bucket handle tear. ( Eg. (2000) carried out capillary rise experiments with different n-alkanes, which are all considered completely wetting, due to their low surface tension. The meniscus may be the curve seen towards the top of a liquid as a result of its container. As the fluid molecules have an inherent tendency to cohere, they attract and adhere to their neighboring molecules, thereby establishing a bond with the molecules on the glass surface. It can be either concave or convex, depending on the liquid and the surface. No meniscus makes measuring very easy. In that case, the liquid appears to stick from the edges forming a concave shape. Reading from above or below the meniscus will result in a parallax error. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The surface tension arises due to cohesive interactions between the molecules in the liquid. With In this study, it was proposed to get the actual constant term r in Washburn equation by plotting the measured value r cos versus the rate of rise of the alkanes (the slope in Equations \ref{4} and \ref{5}). The consent submitted will only be used for data processing originating from this website. The definition of a meniscus is the fibrous cartilage in a knee joint, or the curved upper surface of liquid that touches the sides of a jar, or a lens that is convex on one side and concave on the other. Ex. The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. A meniscus line is the little line that you have at the top of a liquid. 3. The knee meniscus is a special layer of extra cartilage that lines the knee joint. What Is A Meniscus In Chemistry? - Mastery Wiki - Knowledge Base Website You also have the option to opt-out of these cookies. You must get at eye level with the meniscus to obtain an accurate reading. Again, since polar molecules like to stick together, the water in a glass tube will actually tend to stick to the sides of the tube! Keep these guidelines in mind to make sure youre getting the most out of this approach: Avoid whatever activity caused your injury and rest as often as possible. The value will be consistently low or high, depending on whether the reading is taken from above or . Why doesnt water lie flat? Why does a Meniscus form? When oil is in a jar and the oil has a curve on the top of its surface, this is an example of meniscus. The cookie is used to store the user consent for the cookies in the category "Analytics". with a concave meniscus, measure the bottom of the meniscus and for convex meniscus, take the reading from the top of the meniscus. Learn More Now! The meniscus is created by surface tension of the liquid and the extent thatthe liquid wets the wall. This occurs between water and glass. A cartilage disk that acts as a cushion between the ends of bones that meet in a joint. It was discovered however that dynamic advancing contact angle is generally larger than the static one, even for a total wetting liquid and as a result this method can be erroneous. The pieces of volumetric glassware found in the chemistry laboratory are beakers, Erlenmeyer flasks, graduated cylinders, pipets, burets and volumetric flasks. The meniscus (plural: menisci, from the Greek for crescent) is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. Injuries to the meniscus are the most common, and the medial meniscus is torn more often than the lateral meniscus. Which is harder between organic chemistry and inorganic chemistry? This is a collection of ten chemistry test questions dealing with reading the meniscus of a liquid. Explanation: Since mostly everyone in the scientific community reads the measurement of a liquid from it's meniscus, it would be more accurate for everyone to read the amount at the same point rather than having different readings. (See diagram reading line in diagrams A and B). A meniscus is a crescent-shaped fibrocartilaginous anatomical structure that, in contrast to an articular disc, only partly divides a joint cavity. The lowest point in the curve of your liquid, and you need to know it to get a precise reading of your sample. What part of the meniscus curve determines your measurement? Know the Right Way to Read a Meniscus The meniscus is the curve seen at the top of a liquid in response to its container. A convex meniscus occurs when the particles in the liquid have a stronger attraction to each other (cohesion) than to the material of the container (adhesion). What is a curved surface in a graduated cylinder called? In humans they are present in the knee, wrist, acromioclavicular, sternoclavicular, and temporomandibular joints; in other animals they may be present in other joints.. Generally, the term "meniscus" is used to refer to the cartilage of the knee . When water is put in a measuring cylinder, the meniscus curves upwards. The meniscus plays two important roles inside the knee. Necessary cookies are absolutely essential for the website to function properly. The meniscus must be read consistently from the top of the graduated cylinder. and Gast A.P. Meniscus Definition and Examples (Science) - ThoughtCo What should I avoid with a torn meniscus? Copyright 2022 - Science-Atlas.com. Contact angle wettability and adhesion American Chemical Society, USA. Subscribe Now:http://www.youtube.com/subscription_center?add_user=ehoweducationWatch More:http://www.youtube.com/ehoweducationMeniscus is the shape that a li. Born and raised in the city of London, Alexander Johnson studied biology and chemistry in college and went on to earn a PhD in biochemistry. E.g. Which Teeth Are Normally Considered Anodontia. These cookies ensure basic functionalities and security features of the website, anonymously. In effect, this quiz will prove whether or not you have the skills to know the difference between affect and effect. How Is Mitochondrial DNA (mtDNA) Typing Used In Forensic Science? Pages 352-364. A concave surface of a liquid resulting from surface tension. surface of the liquid is called the meniscus. In this article, you will learn what a meniscus is, why it forms, and how you can accurately and precisely measure the volume of a liquid in a laboratory graduated measuring glassware or plasticware.
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