meniscus of water and mercury

. For a flat meniscus, make sure the liquid is level. Don't let scams get away with fraud. Report at a scam and speak to a recovery consultant for free. e.g. Because the force of cohesion between water molec …. It is so when one end of a glass capillary tube is immersed in a trough of mercury. 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. But the shape of mercury measures in the tube become convex upward. If θ is obtuse, i.e. 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. Water meniscus is concave, mercury meniscus is convex. A meniscus can go up or down. A meniscus is the curved surface at the top of a column of liquid. Conversely, the attraction between mercury atoms (cohesion) is stronger than its attraction to the glass (adhesion). 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. Measure so that the line you are reading is even with the center of the meniscus. The cohesive forces in water and mercury are stronger than the adhesive forces to the nonpolar wax on the floor. 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? Why? The angle of contact increases and becomes obtuse. This can be seen between water and glass. Mercury is an example of a liquid that forms convex menisci. . The meniscus of liquid in a capillary tube will be convex upwards if the angle of contract is obtuse. When it has a convex meniscus, the angle of contact is obtuse. measured contact angles of water, mercury, and 20 organic liquids on substrates of quartz, calcite, biotite, and Ca-montmorillonite. The shape of the meniscus observed when water and mercury are taken in two different capillary tubes is concave and convex respectively. C) The low surface tension of mercury. Weak adhesive forces result in spherical drops. NA. Transcribed Image Text: Which best explains why the meniscus of mercury in a glass tube is convex? The temperature range that can be measured by a typical mercury thermometer is −37 to 356 °C. why does mercury have a convex meniscus. Mercury metal is more attracted to itself than to the walls of the glass manometer. 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 . 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 . mercury The curved surface of a liquid inside a container is the meniscus. mercury to the B) The lower attraction of mercury to the glass than to itself. Well sure, you can have a convex meniscus. 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 meniscus of water curves up the sides of the cylinder, while heavy liquids like mercury curves down the cylinder. Why? θ<9o°, then liquid meniscus will be concave upwards. Depending on the direction of pressure . 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? 0. Medium. B) the low surface tension of mercury C) the greater attraction of mercury atoms to the glass than to each other. The form of the meniscus depends on van der waals forces, that is, the interaction between particles. Because mercury still exhibits metallic bonding, even in the liquid state, and metal-metal interactions are stronger than the metal glass . For pure water and pure silver, the angle of contact is 90°. 2. Meniscus and wetting are caused by surface tension. So in this problem wants to know why is it that water forms a concave and just just any glass graduated cylinder. Adhesion occurs between the fluid and the solid inner wall . why does mercury have a convex meniscus . why does mercury have a convex meniscus. Little drops of mercury will form into almost spheres when spilled on most surfaces (gravity will bend them out of shape). ОВСІ, NF3 CHA CH2C1 L Determine the solid with the highest melting point. For water and most liquids, this is the bottom of the meniscus. Give two characteristic properties of a liquid. Mercury is more strongly attracted to itself (cohesion) and is convex in meniscus. E.) Water is an example of a fluid that forms concave menisci. You should always measure light liquids at the bottom of the meniscus and . The shape of the water meniscus in the tube becomes concave upwards. In either case, you are measuring based on the center of the meniscus. Mercury, which is liquid at room temperature, forms . Why a meniscus occurs. 0. water. The strong cohesive forces . 94 from the horizontal to help the cars to stay in the road while moving at high. 0. Typical manometer liquids are mercury, water, and light oils. Adhesion is responsible for a meniscus and this has to do in part with water's fairly high surface tension. 94 from the horizontal to help the cars to stay in the road while moving at high. Shape of a Meniscus. Meniscus is caused by surface tension. 0. A convex meniscus occurs because, as with mercury and glass, the molecules have a greater attraction to each other than to the container. Was this answer helpful? This is the upward or downward curve at the surface of a liquid in a container. Glass is electrically polarizable, and attracts charged . View the full answer. We have a plastic one, The meniscus is going to be flat, so it's going to look like this. It is convex when cohesion is stronger. See an illustration: Meniscus for water and mercury in glass attractive forces between mercury atoms are stronger than the attraction between the mercury and the glass. 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. OTHER SETS BY THIS CREATOR. A meniscus is a curvature in the surface of a fluid (e.g. The meniscus of water in a glass tube is concave, but that of mercury is convex as shown to the right. The Hg-Hg attraction is greater than the Hg-glass attraction. A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. A) The great attraction of mercury to the glass than itself. 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. . 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. 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. OF_ (s) O CHCI (3) O NH3 (s) O LiCl (s) In a glass tube, the meniscus of water is concave, whereas the meniscus of mercury is convex. Water on the other hand, is made up of electrically polar molecules. If the meniscus is convex, then the molecules have a stronger attraction to themselves than the container or neighboring object (e.g. 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. Meniscus occurs when the particles of the liquid stick to the sides of the glass tube. Alcohol does exact the same, but mercury for example, not. mercury to the B) The lower attraction of mercury to the glass than to itself. 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 . 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. why does mercury have a convex meniscus. This occurs . This occurs between water and glass. View solution > The drops of liquid take spherical shape. The meniscus is concave to increase the area of contact between glass and H2O. Published: June 7, 2022 Categorized as: imprisonment 5e dndbeyond . Water does not rise in it. Physics. Therefore, the atoms pull together and away from the glass. Select the statement that explains the difference in the shape of the menisci. This is the upward or downward curve at the surface of a liquid in a container. When cohesive forces are greater than adhesive forces the meniscus is concave, as is the case with glass and water. If θ is 90°, then liquid meniscus will be plane. When a glass capillary immersed in water, the meniscus is concave upwards. Which molecules exhibit only London (dispersion) forces? 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. Capillary penetration in porous media shares its dynamic mechanism with flow in hollow tubes, as both processes are resisted by viscous forces. (ii) in case of mercury . Glass molecules also happen to be polar. As you may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top. Why? If a silica glass tube is positioned vertically in a reservoir of water, the same forces of adhesion and cohesion are at work. Similar questions. 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. D) the weaker attraction of mercury atoms to the glass than to each other. . In the case of water and most liquids, the meniscus is concave. In the case of the convex meniscus, the contact angle θ has a value greater than 90º. E) The repulsion between mercury and the . The concave meniscus formed at the surface of the water column is a result of the adhesive forces being greater than the cohesive forces. It can be either concave or convex. For Mercury it is more attracted to it self. It all depends on if the molecules of the liquid are more attracted to the outside material or to themselves. most liquids are more attracted to the beaker whereas mercury molecules are more attracted to itself It depends on inter-molecular attractions. For pure water and perfectly clean glass, the angle of contact is 0°. Medium. For mercury this is generally not the case and hence discrete mercury beads are formed on co. View solution > The drops of liquid take spherical shape. Therefore, the liquid bathes or wets the glass wall, retaining a quantity of liquid and giving the meniscus a concave shape. For mercury, take the measurement from the top of the meniscus. With water, you can think of it as when water sticks to the inside of a glass. A concave meniscus develops when the liquid molecules are drawn to those in the vessel, which is what you usually would see. Physics. Convex. If you were take that same glass beaker, instead of filling it with water if you filled it with say, mercury. Which best explains why the meniscus of mercury in a glass tube is convex? A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container. When cohesive forces are greater than adhesive forces the meniscus is concave, as is the case with glass and water. As you may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top. The position of the meniscus of the mercury on the temperature scale gives the temperature of the sample. Hence the liquid in the trough is .

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