| Gsa | equals | Apparent specific gravity of the aggregate | Ws | equals | Oven-dry weight of aggregate | |
| Gb | equals | Asphalt binder specific gravity | VS | equals | volume of the solids | |
| Gsb | equals | Bulk specific gravity of the aggregate | Vpp | equals | volume of water permeable pores | |
| Gse | equals | Effective specific gravity of the aggregate | Vap | equals | volume of pores absorbing asphalt | |
| Gmb | equals | Bulk specific gravity of the compacted mixture | Pb | equals | Asphalt content by weight of mix (percent) | |
| Gmm | equals | Maximum theoretical specific gravity of the HMA mixture | Ps | equals | Aggregate content by weight of mix (percent) | |
| G1 | equals | Coarse aggregate specific gravity (retained on the 4.75 mm (No. 4) sieve) | P1 | equals | Coarse aggregate fraction (retained on the 4.75 mm (No. 4) sieve) | |
| G2 | equals | Fine aggregate specific gravity (between the 4.75 mm (No. 4) and 0.075 mm (No. 200) sieve) | P2 | equals | Fine aggregate fraction (between the 4.75 mm (No. 4) and 0.075 mm (No. 200) sieve) | |
| G3 | equals | Mineral filler specific gravity (passing the 0.075 mm (No. 200) sieve) | P3 | equals | Mineral filler fraction (passing the 0.075 mm (No. 200) sieve) | |
| γW | equals | Unit weight of water | Vpp – Vap | equals | volume of water permeable pores not absorbing asphalt |