Elapsed time
in min
Room temperature in ˚C
Hydrometer
reading
Ra
Hydrometer reading after meniscus correction Rh
Effective depth L in cm
Corrected reading
Rc = Rh ± Cm
Value of K
Particle
size
in mm
Percentage finer
0.25
27
45
45.5
8.85
41.9
0.013
0.073
83.8
0.5
27
44
44.5
9
40.9
0.013
0.056
81.8
1
27
41
41.5
9.5
37.9
0.013
0.041
75.8
2
27
36
36.5
10.3
32.5
0.013
0.03
65.8
4
27
29.5
30
11.3
26.4
0.013
0.0224
52.8
8
27
27
27.5
11.8
23.9
0.013
0.0162
47.8
15
27
24
24.5
12.3
20.9
0.013
0.012
41.8
30
27
21
21.5
12.8
17.9
0.013
0.0087
35.8
60
27
18
18.5
13.25
14.9
0.013
0.0063
29.8
1200
26.5
12
12.5
14.25
8.9
0.013
0.0014
17.8