How do you measure viscosity in an experiment?
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To measure viscosity, fill a graduated cylinder with the liquid to be measured and mark the liquid’s positions at the top and bottom of the cylinder. Drop a marble into the liquid and start a stopwatch, then record the time it takes for the ball to drop between the marks.
Which method is used to study viscosity of liquid?
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.
What is viscometer method?
Viscometry or viscosity method was one of the first methods used for determining the MW of polymers. In this method, the viscosity of polymer solution is measured, and the simplest method used is capillary viscometry by using the Ubbelohde U-tube viscometer.
Which instrument is used for viscosity measurement?
viscometer
viscometer, instrument for measuring the viscosity (resistance to internal flow) of a fluid. In one version, the time taken for a given volume of fluid to flow through an opening is recorded.
Which of the following method can be used to determine the viscosity of gas?
The viscosity of a gas provides a means for determining molecular diameters, as viscosity arises from collisions among molecules. A gas sample is drawn through a thin capillary tube. The change in pressure of the system is measured with a manometer as a function of time.
How does a viscosity determine viscometer?
BACKGROUND
- Ostwald viscometer is used to determine viscosity of Newtonian fluid.
- η1 can be determine using following equation.
- η1=ʆ1t1/ ʆ2t2 X η2
- ʆ1=Density of unknown liquid.
- t1 =Time of flow of unknown liquid.
- ʆ2 =Density of standard liquid.
- t2 =Time of flow of standard liquid.
- η2=Viscosity of standard liquid.
What is the effect of temperature on viscosity?
The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.
How do you find the viscosity of a gas?
The way to find the viscosity of a gas is to calculate the rate of z-direction (downward) transfer of x -momentum, as explained in the previous section but one. v(z)=v0z/d.
Which of the following is used to determine the viscosity of oil?
The most common method of determining kinematic viscosity in the lab utilizes the capillary tube viscometer (Figure 1). In this method, the oil sample is placed into a glass capillary U-tube and the sample is drawn through the tube using suction until it reaches the start position indicated on the tube’s side.