Test-tubes | 2080 | 3070 | 4060 | 5050 | 6040 | 7030 | 8020 |
Proportion of sand [s/(s + g) ]% | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
Proportion of fine gravel [g/(s + g) ]% | 80 | 70 | 60 | 50 | 40 | 30 | 20 |