For a specified temperature, the relative viscosity nonlinearly increases with enlarging diameter of SWCNTs. For a given diameter, the relative viscosity of water inside the SWCNTs increases with increasing temperature.
Besides, What is the effect of temperature on viscosity of water and air?
Answer: Explanation: The result is that liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
Keeping this in mind, What will happen to viscosity if water is heated? When a liquid heats up, its molecules become excited and begin to move. The energy of this movement is enough to overcome the forces that bind the molecules together, allowing the liquid to become more fluid and decreasing its viscosity.
Is cold water more viscous?
Scientists have long known that cold water is more viscous than hot water, because the molecules are wiggling less rapidly, so they are effectively stickier.
How can water viscosity be increased?
You can add dextran, PVP (Polyvinylpyrrolidone), PEG (Polyethylene glycol) or another water-soluble polymer. There are number of polysaccharides, mucopolysaccharides, gelatin, proteins, plant resins like gum accacia and synthetic polymers one could use to increase the viscosity of water.
Why does viscosity of air increase with temperature?
From the basis of the kinetic theory of gases, viscosity in gases increases with temperature because the increase in kinetic energy will increase the frequency of collisions between the molecules.
What is the effect of temperature and pressure on viscosity?
Thus, as temperature increases, the average intermolecular forces decrease. The actual manner in which the two quantities vary is nonlinear and changes abruptly when the liquid changes phase. Viscosity is normally independent of pressure, but liquids under extreme pressure often experience an increase in viscosity.
What is the effect of temperature on viscosity Mcq?
With the increase in temperature of a liquid, cohesion increases, leading to the rise in viscosity. Viscosity of a gas is due to the momentum transfer between it’s molecules. With the increase in the temperature of a liquid, molecular motion increases, leading to the fall in viscosity.
What affects water viscosity?
What factors affect viscosity? Viscosity is resistance to flow. For liquids, typically the larger the intermolecular forces (IMF) the higher the viscosity. The other factors that affect viscosity are temperature and the shape of the molecule.
How is viscosity related to temperature?
The viscosity decreases with an increase in temperature. Most liquids suffer the exponential relationship (Seeton, 2006) between temperature and viscosity rather than linear form (Fig. 6.1). The more viscous the fluid, the more sensitive it is to the temperature change.
What happens to viscosity of a liquid with increase in temperature?
The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly.
Which has more viscosity hot or cold water?
As a liquid gets warmer, its viscosity decreases As the temperature of a liquid is raised, the viscosity of the liquid decreases. In other words, warm liquids have less viscosity than cold liquids. … As a result, the viscosity decreases.
Is cold water thicker than warm water?
Cold water has a higher density than warm water. Water gets colder with depth because cold, salty ocean water sinks to the bottom of the ocean basins below the less dense warmer water near the surface.
Does temperature affect viscosity?
The liquid viscosity is highly affected by the heat. The viscosity decreases with an increase in temperature.
How can you change the viscosity?
The simplest way to increase the viscosity of oil while maintaining its purity is to reduce its temperature. Obtain a small refrigerator. You could use the refrigerator in your kitchen, but you risk contaminating your food and beverages with oil fumes. Nothing fancy or overly powerful is required.
How can you change the viscosity of a liquid?
In general, the viscosity of a simple liquid decreases with increasing temperature. As temperature increases, the average speed of the molecules in a liquid increases and the amount of time they spend “in contact” with their nearest neighbors decreases.
How can water viscosity be reduced?
The reduction of size of the clusters is achieved through electrolysis of the water. The electrolysis of the water permanently breaks the hydrogen bonds between the water molecules and thus dissociates the clusters of water molecules, thereby reducing the viscosity of water.
Why does viscosity increase when temperature decreases?
Viscosity vs Temperature for gases
The increase in temperature causes the rise of the energy of gas molecules, which increase the randomness of molecules. More hindrances cause the increase in the intensity of inter-molecular collision. Which results retard the motion of gases, so viscosity increases.
When the temperature increases the viscosity of?
Viscosity in gases arises principally from the molecular diffusion that transports momentum between layers of flow. For gases viscosity increases as temperature increases, while in liquids the additional force between molecules become important, hence viscosity tends to fall as temperature increases.
Is viscosity dependent on pressure?
Based exclusively on very general considerations concerning the relationship between viscosity and “free volume,” we show that, at moderate values of pressure, viscosity increases, as a rule, with increasing pressure, provided the liquid is in stable or metastable (undercooled) equilibrium states.
What is viscosity Mcq?
Viscosity is the resistance of the fluid to change its shape or movement of neighbouring portions relative to one another. The viscosity of the fluid is the fluid’s opposition to flow. Viscosity is measured in terms of a ratio of shearing stress to the velocity gradient in a fluid.
What is unit of viscosity Mcq?
Viscosity MCQ Question 7 Detailed Solution
Viscosity is a measure of resistance to flow which arises due to the internal friction between layers of fluid. … The SI unit of viscosity is poiseiulle (Pl). Its other units are N s m-2 or Pa s. 1 poise = 1 g cm–1s–1 = 10–1kg m–1s–1.
What is SI unit of viscosity Mcq?
Notes: The SI unit of viscosity is poiseiulle (Pl).