Does viscosity depend on silica content?
Viscosity is the resistance to flow (opposite of fluidity). Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
What are the factors affecting the viscosity of the magma?
A magma's viscosity is largely controlled by its temperature, composition, and gas content (see downloadable programs at the bottom of this page). The effect of temperature on viscosity is intuitive. Like most liquids, the higher the temperature, the more fluid a substance becomes, thus lowering its viscosity.
How does viscosity change with silica content?
Magmas with a higher SiO2 content have a higher viscosity. Ultimately, the viscosity of a magma will determine the shape a volcano takes over continued eruptions. A magma's silica content will not only control the rock type that forms, it also controls the relative viscosity of the magma.
How do silica and temperature affect the viscosity of magma?
How do silica and temperature affect the viscosity of magma? Explanation: Viscosity of magma the resistance to flow depends on composition of the magma and temperature. Higher silica content means higher viscosity. … Hence lower viscosity and low gas content mean higher temperature of magma.
What is the silica content?
The silica content of the magma determines how thick the magma is, how easily it flows and how easily dissolved gases within the magma can escape; therefore the silica content determines the characteristic of the volcanic eruption and the shape and size of the resulting volcanic cone.
What is viscosity of magma?
Magma viscosity varies, with temperature, water content, and composition, between about 102 Pa s and about 1011 Pa s.
What is a silica content?
The silica content determines how thick the lava is, how easily it flows and how easily dissolved gases can escape; therefore the silica content determines the characteristic of the volcanic eruption and the resulting volcanic cone.
What are the 3 factors of viscosity?
Those are:
- Fluid Temperature: Usually the viscosity of liquids decreases with an increase in temperature. …
- Flow Conditions: For laminar flow the viscosity of liquid remains constant while for turbulent flow viscosity changes.
- Pressure: With an increase in pressure, the viscosity of gases usually increase.
What are the three factors that influence viscosity of a lava?
The three factors that influence the viscosity of a lava are temperature, the dissolved gases it contains, and its chemical composition.
How is magma viscosity determined?
There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v), where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.
What is silica content in magma?
The silica content of the magma determines how thick the magma is, how easily it flows and how easily dissolved gases within the magma can escape; therefore the silica content determines the characteristic of the volcanic eruption and the shape and size of the resulting volcanic cone.
What is silica content in lava?
The silica content and the amount of gas in the lava determines how fluid the lava is and how easily it will flow. High silica content produces a thick viscous lava that does not flow easily. Low silica content produces a lava that is more fluid and flows more easily.
What is high silica magma?
Volcanic Eruptions: High Silica Lava with high silica content is thick and viscous and does not readily flow. Lava rises up toward the surface but is too thick to squeeze through the cracks and fissures in the Earth. As lava continues to rise upward, pressure continues to build.
What is the viscosity depends on?
The viscosity of a liquid usually depends on its temperature. Viscosity generally decreases as the temperature increases. Viscosity generally increases as the temperature decreases. The viscosity of a liquid is related to the ease with which the molecules can move with respect to one another.
What is viscosity and what factors control it?
One can imagine the strength with which the molecules cling together, which will be proportional to the friction. This strength is known as viscosity. Viscosity determines the friction amount, which determines the amount of energy absorbed by the flow.
What does viscosity depend on?
The viscosity of a liquid usually depends on its temperature. Viscosity generally decreases as the temperature increases. Viscosity generally increases as the temperature decreases. The viscosity of a liquid is related to the ease with which the molecules can move with respect to one another.
What are the factors on which viscosity depends?
In general, viscosity depends on a fluid's state, such as its temperature, pressure, and rate of deformation. However, the dependence on some of these properties is negligible in certain cases. For example, the viscosity of a Newtonian fluid does not vary significantly with the rate of deformation.
Why is silica content in magma important?
The silica content of the magma determines how thick the magma is, how easily it flows and how easily dissolved gases within the magma can escape; therefore the silica content determines the characteristic of the volcanic eruption and the shape and size of the resulting volcanic cone.
What does magma with high silica content form?
High silica content produces a thick viscous lava that does not flow easily. Low silica content produces a lava that is more fluid and flows more easily. Lava is less dense than the surrounding rock and rises up to the surface through cracks and crevices under the Earth.
Does viscosity depend on physical factors?
The viscosity of a material is affected by temperature, pressure, nature of fluid, velocity gradient , etc.
How is viscosity dependent on temperature?
Increasing temperature results in a decrease in viscosity because a larger temperature means particles have greater thermal energy and are more easily able to overcome the attractive forces binding them together.
Which factors viscosity depend?
In general, viscosity depends on a fluid's state, such as its temperature, pressure, and rate of deformation. However, the dependence on some of these properties is negligible in certain cases. For example, the viscosity of a Newtonian fluid does not vary significantly with the rate of deformation.
What are the 3 factors that affect viscosity?
Those are:
- Fluid Temperature: Usually the viscosity of liquids decreases with an increase in temperature. …
- Flow Conditions: For laminar flow the viscosity of liquid remains constant while for turbulent flow viscosity changes.
- Pressure: With an increase in pressure, the viscosity of gases usually increase.
Does viscosity depend on density?
There is no direct relation between viscosity and density.
How does viscosity depend on 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.
Does viscosity depend on velocity?
Fluid velocity through porous media is approximated as inversely proportional to the kinematic viscosity. A decrease in viscosity therefore increases the velocity of a compound through porous media….11.2. 3 VISCOSITY.
| Chemical | Kinematic Viscosity (centistokes) |
|---|---|
| trans-1,2-Dichloroethylene | 0.32 |
Which of the following are ways that viscosity affect gases in magma?
Which of the following are ways that viscosity affects gases in magma? Viscous magma prevents gas from escaping easily.
On what factors does viscosity depend?
In general, viscosity depends on a fluid's state, such as its temperature, pressure, and rate of deformation. However, the dependence on some of these properties is negligible in certain cases. For example, the viscosity of a Newtonian fluid does not vary significantly with the rate of deformation.
What properties affect viscosity?
Viscosity is influenced by the composition of the crude oil, the temperature, dissolved gas content, and the pressure. As temperature increases, the viscosity will decrease.
Does viscosity depend on volume?
The more viscous a fluid is the more the volume it occupies.