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# Viscosity and Volcanoes

by | Oct 30, 2022 | Physics, Experiments

Contents

## Introduction

Viscosity is defined as the resistance which resists the flow of liquid. Therefore, in this experiment, we will be determining whether the temperature affects the flow of liquid. And our result would be related to the volcanoes and their formation.

## Aim

To determine whether the viscosity depends on the temperature and to determine the formation of volcanoes.

## Theory

1. The resistance which resists the flow of any liquid, is defined as the viscosity of that liquid.

2. It is the measure of fluid resistance to deformation at any given rate.

3. It is directly proportional to the thickness of a liquid. For instance, the viscosity of syrup is greater than the viscosity of water.

4. Viscosity occurs due to the force of friction acting between the adjacent layers of liquid that are in relative motion.

5. A liquid that does not have any viscosity or zero viscosity is termed inviscid or zero viscosity.

1. Molasses,

2. Steel ball,

3. Notebook.

## Procedure

Step 1: Perform two experiments to measure the viscosity of molasses and the effects of viscosity on the flow rate.

Step 2: Using the falling rate of the steel ball in a column of molasses, measure the viscosity of molasses at different temperatures.

Step 3: Regress the data to determine the viscosity at any temperature.

Step 4: At different temperatures, calculate the flow rate of the molasses on an incline.

Step 5: Note down your result.

## Observation

1. We observed that our hypothesis was correct which means the viscosity is affected by the temperature.

2. On increasing the temperature, molasses becomes less viscous.

3. The more viscous molasses, the slower it flows from the point of origin.

## Result

1. We concluded that the flow rate depends on the viscosity and the viscosity of molasses is affected by the temperature.

2. The result explains the composition of lava determines the shape of the volcano it makes.

3. Basalt lava has a low viscosity and a high temperature which means it has a high flow rate that carries the lava quickly away from the vent and spreads it to a large area, and forms a shield volcano, having shallow slopes and thin lava flow.

4. Andesite lava has an intermediate temperature and viscosity which means it has an intermediate flow rate that carries the lava less quickly away from the vent and spreads it to a smaller area and forms a strato-volcano, having steeper slopes and thick lava flow.

5. Rhyolite and Dacite lavas have high viscosity and low temperature which means it has a low flow rate that carries it slowly away from the vent causing it to pile up and spread to a smaller area, forming a dome volcano with very steep sides.

## Precaution

1. Measure the temperature carefully.

2. Wear gloves while performing the experiment.

3. Wear eyeglasses to protect your eyes from excessive heat.

## Conclusion

In this experiment, we measured the effect of temperature on the viscosity of molasses and determined the effect of viscosity on the formation of volcanoes.

Q.1 What was the aim of your experiment?

ANS. To determine whether the viscosity depends on the temperature and to determine the formation of volcanoes.

Q.2 How does the viscosity of molasses depend on the temperature?

ANS. On increasing the temperature, molasses becomes less viscous.

Q.3 What do you understand about the viscosity of liquid?

ANS. The resistance which resists the flow of any liquid is defined as the viscosity of that liquid.

Q.4 What do you understand by inviscid?

ANS. A liquid that does not have any viscosity or zero viscosity is termed inviscid or zero viscosity.

Q.5 What kind of volcano does the Andesite lava form?

ANS. Strato-volcano

Q.6 What kind of volcano does the Basalt lava form?

ANS. Shield volcano

Q.7 What kind of volcano does the Rhyolite and Dacite lava form?

ANS. Dome volcano.

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