![]() The properties I’ve described are those associated with elastic materials. ![]() Notice that the pieces break off with a clean sharp edge. Once you get tired of poking, stick a spoon in it and eat some. It may then take a while to settle back to exactly where it started (wibble wobble). If you put a big pile of jelly (not jam, jelly) on a plate and push it, it moves (wibble) and then moves back (wobble). So let’s start with jelly (or “jello” as most of you know it). The trouble with rocks is we don’t have much direct experience of deforming them. A understanding of a rock’s rheological properties tells us how it behaves when a force is applied to it. Rheology is the study of the flow of matter. I have a tendency to throw phrases around, so I want to define some of them properly. Also I’ve bought a new toy I’d like to play with. To understand the geology of mountains, you need to know how they are built, which means you need to know how rocks deform. Gas viscosity is only weakly dependent on pressure near atmospheric pressure.“Wibble wobble, wibble wobble, jelly on a plate” Childrens’ rhyme. The viscosity of gases near room temperature are in the centiPoise range, so that is a commonly used unit. ![]() The viscosity of a gas can be thought of as a measure of its resistance to flow and is measured in the CGS unit Poise = dyne sec/cm 2. Viscosity is also a characteristic of the texture of food. Viscosity of a liquid is an important parameter as it can be used as an indicator of quality by the consumer, in some instances a thicker liquid being thought of as superior quality when compared to a thinner product. The viscosity decreases with an increase in temperature. The liquid viscosity is highly affected by the heat. The least viscous at any temperature must be superfluid liquid helium. Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases. What are the 3 factors affecting the viscosity of magma? Liquids like water have a much lower viscosity compared to liquids such as honey. High viscosity means that the thickness of the material is very thick compared to low viscosity which is rather thin. Volcanoes with steep slopes tend to form from very viscous magma, while flatter volcanoes form from magma that flows easily. The viscosity (thickness) of the magma that erupts from a volcano affects the shape of the volcano. How does viscosity relate to volcanoes magma and the Earth’s interior?īoth the temperature and mineral content of magma affect how easily it flows. In contrast, low viscosity magmas flow more rapidly and form lava flows that cover thousands of square kilometers. Heating reduces viscosity (warm syrup flows more easily than cold.) High viscosity lavas flow slowly and typically cover small areas. How does viscosity affect the movement of magma? Those like ether or gasoline which flow very readily have low viscosities. Liquids which flow very slowly, like glycerin or honey, have high viscosities. What is viscosity Why is it important to volcanic eruptions?ĭefinition: Viscosity refers to a fluid’s resistance to flowing. Thus, basaltic magmas tend to be fairly fluid (low viscosity), but their viscosity is still 10,000 to 100,0000 times more viscous than water.Ĥ5-55 SiO 2 %, high in Fe, Mg, Ca, low in K, Na What are 4 factors that affect viscosity?.What are the 3 factors affecting the viscosity of magma?.How does viscosity relate to volcanoes magma and the Earth’s interior?.How does viscosity affect the movement of magma?.What type of volcano has high viscosity?.Where do we find volcanoes with high viscosity?.What is viscosity Why is it important to volcanic eruptions?.
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