Surface tension and viscosity relationship

surface tension and viscosity relationship

Both phenomena viscosity and surface tension depend on the molecular interaction. But, the viscosity is determined by the interaction between the molecules of. Surface Tension-Viscosity Relationship for Liquids. Harold Schonhorn. J. Chem. Eng. Data, , 12 (4), pp – DOI: /jea Publication. Silverman and Roseveare, J. Am. Chem. Soc. 54, (). Google Scholar Crossref, CAS; 2. Buehler, J. Phys. Chem. Soc. 19, 51 ()., Google Scholar.

surface tension and viscosity relationship

It reveals that the viscosity of milk does not change a lot with increasing temperatures because of its nature—colloid. As the temperature increases, the water molecules move more rapidly; therefore, the hydrogen bonds are being broken. As is shown on the graph, water has a high viscosity at lower temperatures but low viscosity at higher temperatures, because particles gain energy form heat by rising temperatures and become more active.

surface tension and viscosity relationship

Even though the dipole-dipole forces of vinegar decrease with increasing temperatures, the curve of vinegar is less steep than the curve of water, because the density of vinegar is larger than that of water. The density of vinegar is 1. The solubility of CO2 decreases with the increasing temperature.

Most of the CO2 dissolves in the water instead of reacting with the water. The dissolved CO2 is attached to H2O by hydrogen bonds. As the surface tension increases, the viscosity increases, because at higher temperatures the surface tension is low, and also, at higher temperatures the viscosity is low. It is based on the concept that particles in liquid gain energy from heat by rising temperatures and convert the energy into kinetic energy.

Since the particles have more kinetic energy, they move more rapidly, which weakens the intermolecular force attractions in liquids. In conclusion, the purpose of my science fair project is to prove that as temperature increases, viscosity and surface tension both decrease, and to determine the relationship between viscosity and surface tension at a constant temperature.

surface tension and viscosity relationship

My hypothesis, for my science fair project, is that as temperature increases, viscosity and surface tension both decrease. Since viscosity and surface tension are both properties of liquids, there is a relationship between them that surface tension varies directly as viscosity at a constant temperature. My hypothesis was shown to be correct. However, there are experimental errors and statistical errors in the project.

Temperatures I measured are not accurate because the heat transfers to the surroundings; however, I cannot keep the temperature constant because of the limitation of equipments. Also, there are other small experimental errors, such as the measuring time and slight amount of liquid that attaches to the walls of glass cups and of the funnel. I calculate the equations of Surface tension vs. However, because of my limited knowledge on the statistics, I do not know how to calculate the statistical errors.

Viscosity, Surface Tension and Temperature | Science project |

Viscosity may depend on the densities of each liquid. If I were to do the project again, in my opinion, it would not change. The data might be slightly different because of experimental and statistical errors. I think the linear relationship between Surface Tension and Viscosity for all four liquids can be verified by doing the project again.

I would like to research the relationship between surface area and surface tension. Also, I want to expand my research to study the relationship between density, viscosity and surface tension at a constant temperature. Then, I would like to construct a general mathematic equation for these three liquid properties for every liquid for a given temperature.

Viscosity and surface tension

As a result, knowing two of these three liquid properties, we can find out the other property, and we can figure out what the temperature is at that time. Upper Saddle River, NJ: Blood flowing through blood vessels in the human body isn't exactly streamline, but applying Poiseuille's equation in that situation is a reasonable first approximation, and leads to some interesting implications. For blood, the coefficient of viscosity is about 4 x Pa s.

The most important thing to notice about the volume rate of flow is how strongly it depends on the radius of the tube. The flow rate is proportional to r4, so a relatively small change in radius can produce a significant change in flow. Decreasing the radius by a factor of two, for instance, reduces the flow rate by a factor of 16! A This is why it's so important to worry about cholesterol levels, or to worry about other things that can clog the arteries in our bodies - even a minor change in the size of the blood vessels can have a significant impact on the rate at which blood is pumped around our bodies, as well as on how much work our hearts have to do to move that blood around.

surface tension and viscosity relationship

Surface tension You've probably noticed the interesting behavior that can take place at the surfaces of liquids. According to Archimedes' principle, for instance, a steel needle should sink in water. A needle placed carefully on water, however, can be supported by the surface tension - the liquid responds in a way similar to a stretched membrane.

Surface Tension and Viscosity for IIT JEE. By NV Sir

Try it at home - see what you can get to float on water. One way to think of surface tension is in terms of energy.

Viscosity, Surface Tension and Temperature

The larger the surface, the more energy there is. To minimize energy, most fluids assume the shape with the smallest surface area This is why small drops of water are round, for instance - a sphere is the shape with the minimum suface area for a given volume.

Soap bubbles also tend to form themselves into shapes with minimal surface area. It takes work to increase the surface area of a liquid.