![]() The force necessary to move a plane of area A past another in a fluid is given by Equation 2.6. What you are really measuring is the change in volume as the tube has a constant cross area V=Area time height, and you mark the height in units of temperature. The moving plane has area A and requires force F to overcome the fluid’s internal resistance. For example, if you know how the density of mercury (or alcohol) changes as a function of temperature, you can construct a thermometer where you measure the height of the column. Viscosity is a measure of the resistance of a fluid to deformation under shear stress. It’s simpler to maneuver via a low-viscosity fluid (like water) than the usual high-viscosity fluid (like honey). A fluid having a low viscosity is stated to become thin, while a higher viscosity fluid is stated to become thick. No, you actually measure something else that changes as the temperature changes. Viscosity is really a measurement of methods resistant a fluid would be to tries to undertake it. To measure the density of something you measure it's mass and volume, and then take the ration (d=m/v).ĭoesn't a thermometer measure temperature, an intensive property? ![]() You usually measure extensive properties. Several types of fluid behaviors are describedBingham plastic, Newtonian, shear thinning and shear thickeningalong with their respective shear stress vs. Not directly, as they change as the system changes.ĭo you measure intensive of extensive properties? Students are introduced to the similarities and differences in the behaviors of elastic solids and viscous fluids. But a Gas is compressible, and fills the container, so density alone can not indicate what the gas is.Ĭan extensive properties be used to identify what a substance is? For example, if a substance is incompressible (solid and liquid) the density is considered constant at a given temperature and pressure, and can be used to identify a substance (gold has a density of 19.3g/ml, and if a gold ring does not have that density, it is not pure gold (note the inverse is not necessarily true, just because the density is 19.3g/ml does not mean it must be gold, but that it could be gold). If you add one gallon of gasoline at 25 0C to a car's gas tank that contains a gallon of gasoline at 25 0C, you double the mass, volume and distance you could drive (energy of the gas), but the temperature does not double, and the density is the same.Ĭan intensive properties be used to identify what a substance is? Mass and Volume are extensive, while temperature and density are intensive. Make a table on a piece of paper (or on a board) to record your results with a column for each fluid and space underneath to write the times the marbles take. Do a couple of practice runs just to get a feel for how long the marble takes. Observe how long it takes to fall between the lines. What is the Difference Between Extensive and Intensive Properties ?Įxtensive properties depend on the amount of matter (extent of the system), while Intensive do not depend on the amount of system. Take the clean marble and drop it in the liquid. And it's inversely proportional also to the length of the tube. Examples include the state of matter, odor, color, volume, denisty, melting point, boiling point, temperature, electrical conductivity. And the volume flow rate's inversely proportional to the viscosity because the more viscous the fluid, the more it resists flowing, and the less meters cube you'll get per second. ![]() Physical Properties describe the physical state of matter. Note, these solvents must not mix with each other (so one phase must be like an oil, and the next like water, as oil and water do not mix), and the particles will aggregate in the solvent whose densities are closest to them (they sink in lighter density solvents and float in heavier density solvents). The greater the resistance to flow, the higher the viscosity, so for example, syrup has a higher viscosity than water. Understand the concept of viscosity and how it affects the motion of fluids. It can also be thought of as a measure of a fluid’s thickness or its resistance to objects passing through it. ![]() In fact, we can sort plastic particles by placing them into different solvents of different densities, as shown in this Youtube. Viscosity is a measure of a fluid’s resistance to flow. s 1 cP = 0.\): Density of common plastics Plastic Symbol.Examples of these properties could be color, hardness, boiling point, or freezing point. Relationship between pascal-second to poise:ġ0 P = 1 kg Viscosity in the Chemistry Realm: In the field of chemistry, there are many different physical properties of substances and elements. Once the value of K is known, the viscosity can be determined by measuring the amount of time the test liquid flows between the two graduated marks.ġ Pascal-second (Pa Where \(K\) is the value of a liquid with known viscosity and density such as water.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |