What influences the viscosity of magma?
Viscosity of Magmas 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 is the viscosity of magma controlled by?
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.
What determines the viscosity of magma quizlet?
The viscosity of magma depends upon its silica content and temperature.
What viscosity of magma depends upon its silica content and its?
The amount of silica in magma helps to determine its viscosity. The more silica magma contains, the higher its viscosity. Magma that is high in silica produces light-colored lava that is too sticky to flow very far; ex. Rhyolite.
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 quizlet?
Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases.
How does the amount of gases in magma affect viscosity?
Higher silica content means higher viscosity. But lower temperatures and low gas content mean higher viscosity. Hence, lower viscosity and low gas content mean higher temperature of magma.
How does viscosity affect the flow of magma from a volcano?
The speed of a magma flow depends on its viscosity – that is, its resistance to flow – which in turn depends upon how much water and silica are in the magma itself. Magmas with higher silica concentration are more viscous, and thus move slower than magmas with less silica.
What are the three factors that influence viscosity of a lava?
Temperature, composition, and volatile (gas) content largely determine the viscosity of lava.
Which of the following increases the viscosity of magma quizlet?
The viscosity of magma increases with: high % silica and cooler temperatures.
Why does silica increase viscosity?
Temperature: The hotter the lava, the lower the viscosity (the thinner it is). The cooler the lava, the higher the viscosity (the thicker it is). Composition: he more felsic the lava (the more silica in the lava), the higher the viscosity because silica forms chains in the cooling lava even before it crystallizes.
How the viscosity of magma is related to its explosivity?
How is the viscosity of magma related to its explosivity? The more viscous the magma, the more explosive the eruption. Predict the explosivity of a volcano having magma with high silica content and high gas content. It would be a high energy eruption.
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.
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.
What are the three factors that influence the viscosity of a lava?
Temperature, composition, and volatile (gas) content largely determine the viscosity of lava.
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 influence does the viscosity of magma have on volcanic eruptions?
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. Differences in a magma's viscosity will determine the shape a volcano takes.
How does temperature relate to viscosity?
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.
How does the viscosity of magma change as magma cools?
How does the viscosity of magma change as magma cools? The viscosity increases when temperature decreases.
How does temperature and composition of the magma affects its viscosity?
Viscosity of magma, the resistance to flow depends on composition of the magma and temperature. Higher silica content means higher viscosity. But lower temperatures and low gas content mean higher viscosity. Hence, lower viscosity and low gas content mean higher temperature of magma.
How does magma temperature affect viscosity?
Viscosity is anti-correlated to temperature by the fact that a lower temperature means a higher viscosity. In other words, as magma cools, its viscosity increases. This property is increased by crystallization of magma while temperature decreases. Finally, the composition of a magma highly affects its viscosity.
Which of the following will increase the viscosity of magma?
The viscosity of magma increases with: high % silica and cooler temperatures.
Which of the following factors influences the viscosity of magma select all that apply?
Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases.
What is silica 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.
How does silica affect viscosity of magma?
The amount of silica in magma helps to determine its viscosity. The more silica magma contains the higher its viscosity. Magma that is high in silica produces light-colored lava that is too sticky to flow very far ex. … Low-silica magma flows readily and produces dark-colored lava ex.
Is viscosity dependent on temperature?
Viscosity depends strongly on temperature. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature.
Does viscosity depend on physical factors?
The viscosity of a material is affected by temperature, pressure, nature of fluid, velocity gradient , etc.
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 factors control the viscosity of a melt?
Answer: Viscosity in a melt is controlled by its composition (specifically, silica content) and temperature. Temperature affects viscosity because heat causes chemical bonds to break more easily. Therefore, a hotter lava of a given composition is less viscous than a Page 2 cooler lava of the same composition.
What are the factors affecting the viscosity of liquids?
Increase in temperature decreases viscosity. Increases in pressure increase viscosity in liquids. In water, it decreases whereas, in gases, it remains the same.
- Increase in temperature decreases viscosity.
- Increases in pressure increase viscosity in liquids. In water, it decreases whereas, in gases, it remains the same.