alcohol methanol ethanol 1-propanol 2-propanol concentration storage Y storage Y storage Y storage Y wt% modulus / Pa error modulus / Pa error modulus / Pa error modulus / Pa error 0.4 0.562 0.04496 1.748 0.13984 0.276 0.02208 8.646 0.69168 0.6 0.2519 0.02015 18.232 1.45856 0.989 0.07912 23.61 1.8888 0.8 1.35 0.108 115.77 9.2616 3.256 0.26048 77.795 6.2236 1 5.799 0.46392 515.587 41.24696 8.816 0.70528 370.497 29.63976 1.2 32.867 2.62936 70.725 5.658 10.233 0.81864 199.366 15.94928