Discussion Of Results
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Discussion of Results
•The data in the graph shown by Table 1 tells us the relationship of the time of flow of a liquid sample at a given temperature where we can say that propanol is the most viscous of all the four samples for it takes 4-5 seconds to flow from the calibration marks of the viscometer while methanol takes only 2-3 seconds to flow through the calibration marks therefore we can say that methanol’s viscosity is lower than the other three samples. “As the table shows, as temperature rises, the viscocity decreases .”
Liquid Sample
VERAGE TIME REQUIRED TO PASS FROM THE CALIBRATION MARKS AT A GIVEN TEMPERATURE (in sec) at room at 40°C at 50°C at 60°C temperatu re (30°C)
Distilled Water (H2O)
3.277
2.857
2.953
2.533
Ethanol (CH3CH2O H)
3.913
3.823
3.427
2.627
Methanol (CH3OH )
2.827
2.593
2.727
2.44
Propanol (CH3CH2C H2OH )
5.927
5.29
4.65
4.167
The graph shown by Fig. 1 tell us that propanol gathered the highest time of flow at temperatures of 30, 40, 50, and 60 °C which means that propanol is the most viscous of all the liquid samples. This result informs us that temperature greatly affects the viscosity of liquids and as the temperature of the liquid increases, the viscosity of the liquid decreases as well as the time it will take to flow through the capillary tube because time is directly proportional to viscosity while temperature is inversely proportional to viscosity.
Table 2: Determination of relative viscosities of liquid samples in centipoise at a given temperature Distilled Water
Ethanol
Methan ol
Propano l
m (g)
25.9
21.7
20.4
20.8
ρ (g/mL)
1.036
0.868
0.816
0.832
Relative Viscosity
0.7978
0.7982
0.5421
1.159
m (g)
25.8
21.4
20.2
20.5
ρ (g/mL)
1.032
0.856
0.808
0.820
Relative Viscosity
0.6531
0.7249
0.4641
0.9609
m
25.7
21.2
20.0
20.3
ρ (g/mL)
1.028
0.848
0.800
0.812
Relative Viscosity
0.5471
0.5237
0.3932
0.6805
m
25.6
21.1
19.9
20.2
ρ (g/mL)
0.985
0.844
0.796
0.808
Relative Viscosity
0.4668
0.4148
0.3634
0.6299
Temp.
Table 2 however tells us the relationship of density and temperature with the relative viscosity of the liquid samples.
30°C
40°C
50°C
60°C
The graph (see Fig. 2) illustrates that propanol acquired the highest relative viscosities but based from the densities we had solved and according to Poiseulle’s law (Eq’n 1), the viscosity of water must be greater than the viscosities of the other three liquid samples. Density is the main factor that brings about such differences. Through the data we gathered, it is apparent that the density of water is greater than these three liquid by about 0 .2000 g/mL. Since density is directly proportional to the viscosity, therefore, the smaller the density of a liquid is, the smaller will the viscosity be.
•The data in the graph shown by Table 1 tells us the relationship of the time of flow of a liquid sample at a given temperature where we can say that propanol is the most viscous of all the four samples for it takes 4-5 seconds to flow from the calibration marks of the viscometer while methanol takes only 2-3 seconds to flow through the calibration marks therefore we can say that methanol’s viscosity is lower than the other three samples. “As the table shows, as temperature rises, the viscocity decreases .”
Liquid Sample
VERAGE TIME REQUIRED TO PASS FROM THE CALIBRATION MARKS AT A GIVEN TEMPERATURE (in sec) at room at 40°C at 50°C at 60°C temperatu re (30°C)
Distilled Water (H2O)
3.277
2.857
2.953
2.533
Ethanol (CH3CH2O H)
3.913
3.823
3.427
2.627
Methanol (CH3OH )
2.827
2.593
2.727
2.44
Propanol (CH3CH2C H2OH )
5.927
5.29
4.65
4.167
The graph shown by Fig. 1 tell us that propanol gathered the highest time of flow at temperatures of 30, 40, 50, and 60 °C which means that propanol is the most viscous of all the liquid samples. This result informs us that temperature greatly affects the viscosity of liquids and as the temperature of the liquid increases, the viscosity of the liquid decreases as well as the time it will take to flow through the capillary tube because time is directly proportional to viscosity while temperature is inversely proportional to viscosity.
Table 2: Determination of relative viscosities of liquid samples in centipoise at a given temperature Distilled Water
Ethanol
Methan ol
Propano l
m (g)
25.9
21.7
20.4
20.8
ρ (g/mL)
1.036
0.868
0.816
0.832
Relative Viscosity
0.7978
0.7982
0.5421
1.159
m (g)
25.8
21.4
20.2
20.5
ρ (g/mL)
1.032
0.856
0.808
0.820
Relative Viscosity
0.6531
0.7249
0.4641
0.9609
m
25.7
21.2
20.0
20.3
ρ (g/mL)
1.028
0.848
0.800
0.812
Relative Viscosity
0.5471
0.5237
0.3932
0.6805
m
25.6
21.1
19.9
20.2
ρ (g/mL)
0.985
0.844
0.796
0.808
Relative Viscosity
0.4668
0.4148
0.3634
0.6299
Temp.
Table 2 however tells us the relationship of density and temperature with the relative viscosity of the liquid samples.
30°C
40°C
50°C
60°C
The graph (see Fig. 2) illustrates that propanol acquired the highest relative viscosities but based from the densities we had solved and according to Poiseulle’s law (Eq’n 1), the viscosity of water must be greater than the viscosities of the other three liquid samples. Density is the main factor that brings about such differences. Through the data we gathered, it is apparent that the density of water is greater than these three liquid by about 0 .2000 g/mL. Since density is directly proportional to the viscosity, therefore, the smaller the density of a liquid is, the smaller will the viscosity be.
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