![]() Supported by the results obtained with other aqueous solutions, this paper deals with the possibility of using the ultra-weak delayed luminescence (DL) to investigate water structuring in a mixture with glycerol, characterized only by hydrogen bonds between the various molecules. Spectral and temporal characteristics of DL decays give information on the two components of the mixture, by evidencing the contribution of water at glycerol concentrations close to the values used in cryopreservation. DL results have shown a correlation with LDW clusters size as determined by other researchers on the basis of neutron diffraction experiments and computational modelling, as reported in Literature. The role of water and its anomalous properties in the chemistry of life have intrigued generations of scientists and the behaviour of water constitutes an open task up to now. Water is not just a solvent but it actively engages and interacts with biomolecules at nanoscale level in complex and essential ways for establishment and maintenance of life. The structure of hydration shells determines the biological functions of a protein and influences interaction with other protein or substrates. Please double check.The extensive three-dimensional hydrogen bond network of H 2O molecules plays a fundamental role in the behaviour of water. ^ This was in the attempt to achieve kg/ms 2 I used \frac X 1000000 to give Density in kg/m3 Then Finally i am told to plot a velocity over r 2 graph, and then to determine the viscosity of glycerol(η) from the equation desribed above. I am not told what unit i am attempting to measure, I was simple given an experiment sheet with the Aim to:-ĭetermine the coefficent of viscosity of glycerol. This brings me to belive the higher mass caused a slower acceleration not allowing them to reach terminal velocity in 20cm thus distorting the results? The tube was around 3inches wide so i don't think it would be that? The length of the tube was only 20cm. In the lower ranges 4-8mm the results are all quite constant(around 1.4) but at 10mm the results begin ro rise incrimentally(10mm=1.7,12mm=1.8,14mm=2.2). I tested ball bearings ranging from 4mm-14mm. The tube was much larger than the balls in diameter so i don't think the walls would have affected the results as drastically as this. I think the problem was with the length of my tube, and the heavier balls where not reaching terminal velocity. On another note, what were the units of the viscosities you calculated. If the ball diameter is on the same order as the cylinder diameter, the relationship you used will not be as accurate.) Did you wait for the balls to reach terminal velocity before you measured the velocity? How did the diameters of the balls compare with the diameter of the cylinder? (The equation you used applies to the balls falling through an infinite ocean of the fluid. The viscosity is a property of the liquid, and is independent of the objects that are used. Here is one of my test, does the final number represent the viscosity coeffient of the fluid or does it represent the resistance the object feels? or does it represent nothing? :P This is not a physics course and I do not study physics so if u can try to keep it simple it would be nice :) If this is the case how to can i make the connection between this ristance and the coeffient viscosity of the fluid? This is because the number I am receiving from the sum is raising in line with the radius of the sphere. ![]() I have crunched some number but I think they represent the reistants the sphere feels in the fluid, not the actual viscosity of the fluid. O = the density of the glycerol(given to me as 1260kg/m 3 I have been given an experiment to perform, whereby I drop steel ball bearings into a glass measuring cylinder, and time how long it takes for the ball bearing to fall a set distance.įrom this I should be able to work out the viscosity coeffienct of the glycerol.
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