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 . Mercury does not wet glass – the cohesive forces within the drops are stronger than the adhesive forces between the drops and glass.
Why water surface is concave?
A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container . This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
What is the shape of free surface at critical temperature?
If a free liquid is rotating about an axis, the free surface will take the shape of an oblate spheroid : the approximate shape of the Earth due to its equatorial bulge.
Why concave meniscus is formed in case of water?
A concave meniscus occurs when the particles of the liquid are more strongly attracted to the container (adhesion) than to each other (cohesion) , causing the liquid to climb the walls of the container. This occurs between water and glass.
Why is the meniscus concave in water quizlet?
The concave shape of the meniscus shows that water’s adhesive forces toward the glass are stronger than its cohesive forces . The intermolecular forces among the molecule of a liquid. The forces between the liquid molecules and their container.
Is water concave or convex?
Water meniscus is convex , mercury menisucs is concave
This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
What liquids have surface tension?
There is only one liquid having higher surface tension and that’s mercury which is a liquid metal with a surface tension of almost 500 mN/m.
At what temperature does surface tension become zero?
Figure 2-5 demonstrates the surface tension of water from 0°C to its critical value of 374.2°C In general, the surface tension of a liquid in equilibrium with its own vapor decreases with temperature and becomes zero at the critical point.
Can the surface tension be negative?
It is shown that the surface tension becomes negative only for solutions with strong repulsion between the components . ... Thus, for a macroscopic solution, the negative surface tension is possible only in a nonequilibrium state. However, for a nano-solution, negative surface tension is also possible in equilibrium state.
Which state of matter moves the fastest?
Because the particles are freer to move around in gases than in solids or liquids, gas particles move the fastest. Like a liquid, a gas flows and takes the shape of its container.
What is the correct level at which to read a meniscus?
A meniscus occurs because of surface tension in the liquid and must be read at eye level. For a concave meniscus, the correct volume will be read at the bottom of the curve . For a convex meniscus, the opposite is true and the correct reading will be at the top of the curve.
What does Menacious mean?
1 : a crescent or crescent-shaped body . 2 : a concavo-convex lens. 3 : the curved upper surface of a column of liquid. 4 : a fibrous cartilage within a joint especially of the knee.
What is the skin of water called?
Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.
Which of the following gives water its cohesive properties quizlet?
Which of the following gives water its cohesive properties? Water’s polarity makes it attracted to other charged molecules . Each water molecule has a partially positive end and a partially negative end, allowing hydrogen bonding to occur between water molecules.
What liquids form convex meniscus?
When liquid mercury is confined in a tube, its surface (meniscus) has a convex shape because the cohesive forces in liquid mercury tend to draw it into a drop.
What is a torn meniscus in the knee?
The meniscus is a C-shaped piece of tough, rubbery cartilage that acts as a shock absorber between your shinbone and thighbone . It can be torn if you suddenly twist your knee while bearing weight on it. A torn meniscus is one of the most common knee injuries.
