Consider an object of characteristic length \(0.015 \mathrm{~m}\) and a situation for which the temperature difference is \(10^{\circ} \mathrm{C}\). Evaluating thermophysical properties at the prescribed conditions, determine the Rayleigh number for the following fluids: air (1 atm, \(400 \mathrm{~K}\) ), helium (1 atm, \(400 \mathrm{~K})\), glycerin (285 K), and water (310 K).