Calculate the rayleigh number for a pot of water

Question

Problem

Calculate the Rayleigh number (in Pascal seconds) for a pot of water being heated from below with a temperature difference of 1 deg. C between the top and bottom of the water in the pot.

The thermal expansion coefficient for water is 210 x 10^-6 with units of 1/C.
The depth of the water in the pot is 0.0001 m.
Assume a thermal diffusivity of water of 0.143 mm²/s.