Physical parameters (10): viscosity of magma
Resistance to flow = internal friction
Example: air: 10-5 Pa.s
water:
10-3 Pa.s
basalts:
101 to 102 Pa.s
(Kilauea)
basalts:
102 to 103 Pa.s
(Stromboli)
Silicic:
104 to 106 Pa.s
(explosive)
function of composition,
and temperature
very large range of values