The slower propagation of light in gas or water than in air or vacuum may be attributed to a greater density, or to a less rigidity, in the former case; or we may adopt the more complicated supposition that both these quantities vary, subject only to the condition which restricts the ratio of velocities to equality with the known refractive index.
The following are some of his figures, the velocity v beings in kilometres per hour: For velocities from o to 24 km.
Per hour q exceeded unity n 74 cases out of too; but for velocities over 50 km.
Simpson observed a fall in q for wind velocities exceeding 2 on Beaufort's scale.
Per hour, but for greater velocities up to 80 km.
How would you define velocities? Add your definition here.