0. For pure water and pure silver, the angle of contact is 90°. Capillary penetration in porous media shares its dynamic mechanism with flow in hollow tubes, as both processes are resisted by viscous forces. Conversely, the attraction between mercury atoms (cohesion) is stronger than its attraction to the glass (adhesion). A convex meniscus (sometimes called a backwards meniscus) is produced when the molecules of the liquid are more strongly attracted to each other than to the container. The air pressure on the upper or concave side of the meniscus is the atmospheric pressure P. We know that the pressure on the convex side of the free surface is less than that on the concave side. Water does not rise in it. 100% (2 ratings) The shape of the meniscus is determined by the forces of cohesion and adhesion, and the meniscus forms in the capillary tube. Depending on the direction of pressure . Report at a scam and speak to a recovery consultant for free. The position of the meniscus of the mercury on the temperature scale gives the temperature of the sample. The form of the meniscus depends on van der waals forces, that is, the interaction between particles. The shape of the meniscus observed when water and mercury are taken in two different capillary tubes is concave and convex respectively. (ii) in case of mercury . When a liquid has concave meniscus, the angle of contact is acute. In some cases, the meniscus appears flat (e.g., water in some plastics). E) electrostatic repulsion . As you may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top. 1 See answer brrainly4473 is waiting for your help. The metal is more attracted to itself than to the sides of the glass. Physics. 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. But if the capillary tube is filled with nitrogen gas, then the temperature range can be further increased since nitrogen is an inert gas and . It occurs with water and a tube made of glass. A concave meniscus develops when the liquid molecules are drawn to those in the vessel, which is what you usually would see. A good example of this shape of meniscus may be seen with mercury in a glass container. The shape of the water meniscus in the tube becomes concave upwards. ОВСІ, NF3 CHA CH2C1 L Determine the solid with the highest melting point. View solution > The drops of liquid take spherical shape. Which molecules exhibit only London (dispersion) forces? mercury The curved surface of a liquid inside a container is the meniscus. so . why does mercury have a convex meniscus; By . The angle of contact increases and becomes obtuse. Physics. It's worth saying here that mercury was a common manometer fluid in the past, but has largely been replaced due to its environmental and health hazards. Mercury has very small adhesive forces with most container materials, and strong cohesive forces. A high-speed test track for cars has a curved section — an arc of a circle of radius R = 3000 m. The curved section is banked at angle θ = 7 . Similar questions. . Correct option: (3) Force of cohesion, between water molecules, is less that n the force of adhesion between water and glass; the reverse is true for mercury. When cohesive forces are greater than adhesive forces the meniscus is concave, as is the case with glass and water. Hence the liquid in the trough is . Definition. 0. Typical manometer liquids are mercury, water, and light oils. The meniscus of mercury in a glass capillary tube is convex because of A) the very high density of mercury as compared with water. 0. Water meniscus is concave, mercury meniscus is convex. Water and glass meniscus is a down ward curve because the glass pulls on the water molecules with a slightly greater force than that which exists . For Mercury it is more attracted to it self. The meniscus of water in a glass tube is concave, but that of mercury is convex as shown to the right. Surface tension of ethanol is one third that of water. Answer (1 of 3): The meniscus forms when the attractive force on the liquid molecules are different between the walls of the container and the liquid. . If θ is acute angle, i.e. When cohesive forces are greater than adhesive forces the meniscus is concave, as is the case with glass and water. But in a plastic graduate cylinder it forms a flat meniscus. In a science class, this liquid is usually water or some sort of aqueous solution, and the column is usually a graduated cylinder or a pipet. Water on the other hand, is made up of electrically polar molecules. A meniscus is the curved surface at the top of a column of liquid. Due to difference in surface tension.water forms concave meniscus because adhesive force between water molecule and glass is more than cohesive force between wa… brrainly4473 brrainly4473 06.12.2017 Science Secondary School answered Why shapes of meniscus of water and mercury are different? Conversely, a concave meniscus occurs when the particles of the liquid are more strongly attracted to the container than to each other, causing the liquid to climb the walls of the container. The word itself comes from the Greek for 'crescent', and you can . Measure so that the line you are reading is even with the center of the meniscus. As you may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top. View solution > The drops of liquid take spherical shape. For water and most liquids, this is the bottom of the meniscus. The meniscus is concave to increase the area of contact between glass and H2O. You should always measure light liquids at the bottom of the meniscus and . A flat meniscus occurs with water in some types of plastic tubes; tubes made out of material that water does not stick to. Transcribed Image Text: Which best explains why the meniscus of mercury in a glass tube is convex? A convex meniscus occurs because, as with mercury and glass, the molecules have a greater attraction to each other than to the container. On the other hand surface tension of mercury is si. Don't let scams get away with fraud. Meniscus occurs when the particles of the liquid stick to the sides of the glass tube. A convex meniscus occurs when the liquid particles are more attracted to each other than . glass han to itself. mercury to the B) The lower attraction of mercury to the glass than to itself. It is convex when cohesion is stronger. When a glass capillary immersed in water, the meniscus is concave upwards. Post author By ; Post date bataleon evil twin snowboard; every moment holy table of contents on why does mercury have a convex meniscus on why does mercury have a convex meniscus See Page 1. or meniscus, of the water is therefore U-shaped. It can be either concave or convex. This occurs . Was this answer helpful? Little drops of mercury will form into almost spheres when spilled on most surfaces (gravity will bend them out of shape). measured contact angles of water, mercury, and 20 organic liquids on substrates of quartz, calcite, biotite, and Ca-montmorillonite. . water) as a result of molecular interactions with a container or object. In a science class, this liquid is usually water or some sort of aqueous solution, and the column is usually a graduated cylinder or a pipet. Post author By ; Post date bataleon evil twin snowboard; every moment holy table of contents on why does mercury have a convex meniscus on why does mercury have a convex meniscus E) The repulsion between mercury and the . Science Chemistry Q&A Library Which best explains why the meniscus of mercury in a glass tube is convex? attractive forces between mercury atoms are stronger than the attraction between the mercury and the glass. The concave meniscus formed at the surface of the water column is a result of the adhesive forces being greater than the cohesive forces. why does mercury have a convex meniscus. A) The greater. This is a consequence of metallic bonding; and it is formally termed an ameniscus, or a convex meniscus (as opposed to the concave menisci, that water forms). B) the low surface tension of mercury C) the greater attraction of mercury atoms to the glass than to each other. The concave meniscus formed at the surface of the water column is a result of the adhesive forces being greater than the cohesive forces. why does mercury have a convex meniscus . If you filled it with mercury, you would get a meniscus that looks like this where there's a bulge near the center when you're further away from the container than when you're at the container. This may be seen between mercury and glass in barometers. Meniscus is caused by surface tension. Mercury is more strongly attracted to itself (cohesion) and is convex in meniscus. Therefore, the atoms pull together and away from the glass. A concave meniscus forms when the liquid molecules are more attracted to the container via adhesion than to each other via cohesion. D) the weaker attraction of mercury atoms to the glass than to each other. If the interaction between a particle of water and a particle of recipient is strong than the interaction between water itself, then the water rises and the meniscus is convex. The meniscus is concave when adhesive forces are stronger than cohesive forces. Give two characteristic properties of a liquid. Mercury produces a convex meniscus. Mercury. Which best explains why the meniscus of mercury in a glass tube is convex? This is the upward or downward curve at the surface of a liquid in a container. If θ is obtuse, i.e. A meniscus occurs because of surface tension. In a science class, this liquid is usually water or some sort of aqueous solution, and the column is usually a graduated cylinder or a pipet. why does mercury have a convex meniscus. Glass molecules also happen to be polar. Don't let scams get away with fraud. Therefore, the liquid bathes or wets the glass wall, retaining a quantity of liquid and giving the meniscus a concave shape. In either case, you are measuring based on the center of the meniscus. e.g. We have a plastic one, The meniscus is going to be flat, so it's going to look like this. θ>9o°, then liquid meniscus will be convex . A meniscus is a curvature in the surface of a fluid (e.g. Conversely, a concave meniscus occurs when the molecules of the liquid attract those of the container. The meniscus of liquid in a capillary tube will be convex upwards if the angle of contract is obtuse. A high-speed test track for cars has a curved section — an arc of a circle of radius R = 3000 m. The curved section is banked at angle θ = 7 . . Similar questions. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container. 0. Mercury metal is more attracted to itself than to the walls of the glass manometer. Alcohol does exact the same, but mercury for example, not. Adhesion occurs between the fluid and the solid inner wall . A) The great attraction of mercury to the glass than itself. C) The low surface tension of mercury. It all depends on if the molecules of the liquid are more attracted to the outside material or to themselves. A meniscus is the curved surface at the top of a column of liquid. The strong cohesive forces . why does mercury have a convex meniscus. The Hg-Hg attraction is greater than the Hg-glass attraction. water. This can be seen between water and glass. When it has a convex meniscus, the angle of contact is obtuse. why does mercury have a convex meniscus. E) The repulsion between mercury and . Why? A concave meniscus occurs when the particles of the liquid are more strongly attracted to the container than to each other (), causing the liquid to climb the walls of the container. The meniscus is convex to minimize the . Weak adhesive forces result in spherical drops. This occurs between water and glass. θ<9o°, then liquid meniscus will be concave upwards. Well sure, you can have a convex meniscus. Give two characteristic properties of a liquid. e.g. This is the upward or downward curve at the surface of a liquid in a container. Published: June 7, 2022 Categorized as: imprisonment 5e dndbeyond . Explanation: Metallic bonding clearly accounts for the convex meniscus observed in mercury metal in glass vessels. A convex meniscus occurs, for example, between Mercury and glass in barometers and thermometers. why does mercury have a convex meniscus. westboro baptist church lauren. who did mahalia jackson marry; davis broadcasting community calendar; why does mercury have a convex meniscuschat imagenes temporales . When mercury is placed in a graduated cylinder, the cohesive forces in the mercury are stronger than the adhesive forces between the mercury and the glass. Consequently, a common apparatus used to demonstrate the phenomenon is the capillary tube.When the lower end of a glass tube is placed in a liquid, such as water, a concave meniscus forms. 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 cohesive forces in water and mercury are stronger than the adhesive forces to the nonpolar wax on the floor. For mercury this is generally not the case and hence discrete mercury beads are formed on co. OTHER SETS BY THIS CREATOR. Mercury is an example of a liquid that forms convex menisci. A meniscus occurs because of surface tension. The actual water vapor pressure would then be 88% of this or 33.4 mmHg. westboro baptist church lauren. -If you put mercury in a glass tube, the meniscus is straight because the mercury atoms can form bonds with another but not with the glass; as a result, the cohesive forces are much greater than the adhesive forces and the meniscus is shaped like an inverted U. In case of colorless liquid it is easy to observe the phase boundary, wether it is convex or concave hence in colorless liquids upper or lower meniscus may be considered. argo parts amazon. It is so when one end of a glass capillary tube is immersed in a trough of mercury. . So if we have a glass graduated cylinder, the meniscus is going to curve downward. In terms of adhesion and cohesion, explain why mercury has a convex meniscus in glass tube. Of course if you use a PTFE container (and you can do so) you could form a convex meniscus with most liquids. D) The high density of mercury compared to water. The shape of the meniscus observed when water and mercury are taken in two different capillary tubes is concave and convex respectively. The temperature range that can be measured by a typical mercury thermometer is −37 to 356 °C. See an illustration: Meniscus for water and mercury in glass 94 from the horizontal to help the cars to stay in the road while moving at high. Water is strongly attracted to glass and its meniscus is concave (adhesion). In the case of the convex meniscus, the contact angle θ has a value greater than 90º. Glass is electrically polarizable, and attracts charged . Water is an example of a fluid that forms concave menisci. However in case of colored liquids observing this phase boundary is not possible, hence only upper meniscus is considered.What is upper meniscus and lower meniscus? mercury which is non-polar thus not attracted to its glass container . The word itself comes from the Greek for 'crescent', and you can . Answer (1 of 2): Because mercury does not wet the material of the container. For most liquid like water it is more attracted to the beaker than itself so it will try to be as close to the beaker as possible a meniscus upward would allow more water molecules to touch the beaker. Medium. It is called a meniscus. Convex. For instance with glass, water has a degree of wetting where the surface of the water seeks to extend across the glass surface. Because the force of cohesion between water molec …. But the shape of mercury measures in the tube become convex upward. You can see this at the top of the graduated cylinder, where the water will slightly creep up the sides and form a curve, which is the meniscus. The meniscus of water curves up the sides of the cylinder, while heavy liquids like mercury curves down the cylinder. Report at a scam and speak to a recovery consultant for free. 3. h α, \(\frac{1}{r}\) this is in the form y α \(\frac{1}{x}\) Hence when we draw graph between 'h' and 'r' we get a graph of hyperbola. mercury to the B) The lower attraction of mercury to the glass than to itself. glass han to itself. A meniscus can go up or down. Rather it falls in the tube by virtue of obtuse angle of contact. Why a meniscus occurs. Was this answer helpful? 2. 94 from the horizontal to help the cars to stay in the road while moving at high. B) The lower attraction of mercury to the glass than to itself C) The low surface tension of mercury D) The high density of Mercury compared to water. So in this problem wants to know why is it that water forms a concave and just just any glass graduated cylinder. A) The greater. In the case of water and most liquids, the meniscus is concave. Why? A meniscus is the curved surface at the top of a column of liquid. If you were take that same glass beaker, instead of filling it with water if you filled it with say, mercury. If θ is 90°, then liquid meniscus will be plane. So it's going to look like that. For mercury, take the measurement from the top of the meniscus. Water can wet the surface of glass because the adhesive force of attraction between water molecules and the glass surface is greater than the cohesive forces of attraction between the water molecules. NA. D) The high density of mercury compared to water. E.) A small drop of liquid placed on a uniform, perfectly flat, solid surface, will not always spread completely over this surface, but the edge of the drop may make an angle 6 with the . Explanation: The shape of the meniscus, of a given liquid, in a given container, is determined primarily by the comparative magnitudes of the relevant forces of cohesion and adhesion.
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