Any help with this basic college problem. 1. The problem statement, all variables and given/known data The following readings were obtained in an experiment to find the coefficient of viscosity of water n by measuring the rate of flow of water through a horizontal capillary tube. Diameter of capillary tube = 1.40 mm Length of capillary tube, l = 21.0 cm Pressure difference between end of tube, p =18.5 cm water rate of water flow, v/t = .74 cm^3/s If the diameter of the tube is measured to +/- .05mm, the length to +/- 1mm, the pressure difference to +/- 2 mm, water rate of flow to +/- 0.01cm^3/s and the equation used is V/T= pi p r^3/8nl Where r= radius of the tube, calculate the percentage for the value of the coefficient of viscosity of water. 2. Relevant equations V/T= pi p r^3/8nl 3. The attempt at a solution So here is where i come in. Now i tried to tackle this question in parts. First i tried to go about this in a away to not have to use delta margin of error formulas because frankly i dont understand them. The problem has to do with viscosity but the topic we are on in physics is really uncertainty so i dont have much of a background solving viscosity related problems. The first thing i did was try to convert every thing into meters sooo Pressure difference: 18.5cm = .185m Length of capillarity tube = 21 cm = .21m diameter of capillarity tube = 1.4mm = .0014m Radius = .7 mm = .0007m Rate of water flow = .74cm^3/s = .00000074 m^3/s Margins of error Diameter = .05 mm = .00005m Length= 1mm = .001m pressure difference = 2mm = .002m Rate of change =.01cm^3/s = .00000001 cm^3/s Then me and my friend both tried to rearrange the formula and we got n =pi p r^3/8 * rate of water * length. This maybe where we went wrong. Anyway my methodology was to use the maximum possible values on one calculation using the plus/minus and the minimum possible values and then averaging them off. So i ended up with .00016076 as the maximum value and .000159755 as the minimum value, i then averaged them and found the magnitude between each value to find the plus or minus , which gave me .000160275 =/- .00000052. I then divided the .000160275 by .00000052 and multiplied by 100 to give me a .32% fractional error. Now i think my answer is wrong because a .32 fractional error seems too small and i think when i transposed the formula I made an error. My friend also tried the problem he used (as i said above) the same formula and ended up with a final answer of .000160275 =/- 2.2 * 10^-5, which he said gave him an error percent of 13% which to me sounds more plausible, but i suspect both of our answers are wrong as we both ended up with our answers in seconds, ( i have researched but can't find a coherent answer for what the unit should be). Any help would be greatly appreciated I tried to make this as compact as possible but ive exhausted so many avenues of rechecking this problem so i have a lot to write lol. Thank you for your time.