Solute concentration, kmol of salt/kg of solution

Concentration difference between two successive fringes

Concentration difference between the saturated and supersaturated solution

Distance of the screen from the optical window (also diameter of the growth chamber), m

RMS error

Focal length of the de-collimating mirror, m

Height of the fluid layer (rectangular cavity), m (also, image size as seen through the optical window)

Distance traversed by the laser beam through the test cell (also, crystal thickness in the vertical direction), m

Molar concentration of the solution, moles per 100 gm of KDP solution (also, total number of grid points on the reconstructed plane for tomography reconstruction)

Local Nusselt number defined as wall heat flux×cavity height/fluid conductivity

Refractive index of the fluid

Refractive index of the ambient

Spatial frequency in the CBP algorithm

radial coordinate

Perpendicular distance of the data ray from the center of the object

Time, hr

Temperature, K 

Reference temperature, K

Temperature difference between successive fringes, K

Filter function

Cartesian coordinates, with z parallel to the direction of propagation of light