What is crystallization process?
Crystallization is a process whereby solid crystals are formed from another phase, typically a liquid solution or melt. Crystal. Crystal is a solid particle in which the constituent molecules, atoms, or ions are arranged in some fixed and rigid, repeating three-dimensional pattern or lattice.
Why is acetone used for cleaning viscometer?
Highly volatile solvents are recommended for cleaning since any remaining solvent will evaporate quickly after the sample has been flushed from the viscometer. Acetone is commonly used as the second solvent because of its high volatility and its ability to dissolve traces of petroleum solvents and water.
Why do we use viscometer?
A viscometer (also called viscosimeter) is an instrument used to measure the viscosity of a fluid. For liquids with viscosities which vary with flow conditions, an instrument called a rheometer is used. Viscometers only measure under one flow condition.
How does viscosity vary with temperature?
With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.
Which one is a type of viscometer?
Three main types of viscometer are used: capillary tube (e.g., Ostwald), coaxial cylinder (e.g., Brookfield, Couette) and falling sphere (e.g., Hoeppler). For research, a sophisticated controlled stress rheometer such as a Carrimed or Bohlin may be used.
How does a Stabinger viscometer work?
The highly precise Stabinger Viscometers™ are based on the Couette measuring principle and have an integrated density measuring cell. A measuring rotor with a built-in magnet floats freely in the sample. The sample’s shear forces drive the rotor while magnetic effects retard its rotation.
What is the opposite of viscosity?
The opposite of viscosity is fluidity which measures the ease of flow while liquids such as motor oil or honey which are “sluggish” and high in viscosity are known as viscous.
What is viscosity made of?
Viscosity is the measure of a substance’s resistance to motion under an applied force. The result is typically expressed in centipoise (cP), which is the equivalent of 1 mPa s (millipascal second). Shear stress is the force per unit area required to move one layer of fluid in relation to another.