Property | Symbol | Typical value | Variation range |
---|---|---|---|
Melt density | ρ r | 2.5×103 kg m–3 | |
Bulk modulus of melt | K l | 1.2×1010 Pa | |
Gas constant | B | 8.31 J K–1 mol–1 | |
Magma temperature | T | 1100 K | |
Melt viscosity | η f | 105 Pa s | 104–105 Pa s |
Gas bubble number density | n | 1015 m–3 | 1012–1018m–3 |
Diffusivity | D | 10–9 m2/s | 10–10–10–8 m2/s |
Initial pressure difference | Δp | 0.1 MPa | 0.1–1 MPa |
Conduit radius | a | 10 m | 3–10 m |