Nd/Na = -V.g.hd(beta-beta1)/KT

NdNa: No of particules(mole)
V: Volume
g: gravitational acceleration
hd: distance
beta: densities(mass/volume)
k: Boltzman constant (joules/kelvin)
T: absolute temperature(kelvin)
volume = L3
gravitational acceleration L/T2
1joule = 1kgm2/S2

To get the value of Nd/Na using the given equation, you need to know the following values:

NdNa: Number of particles (in moles)
V: Volume of the system
g: Gravitational acceleration
hd: Distance
beta: Densities (mass/volume)
beta1: Densities at height h1 (mass/volume)
k: Boltzmann constant (joules/kelvin)
T: Absolute temperature (in kelvin)

Here's how you can obtain the value:

1. Determine the values of V, g, hd, beta, beta1, k, and T. Make sure they are all expressed in consistent units. For example, if V is given in cubic meters (m^3), g should be in meters per second squared (m/s^2), and so on.

2. Substitute the known values into the equation:

NdNa = -V * g * hd * (beta - beta1) / (k * T)

3. Calculate the right-hand side of the equation.

- Multiply V by g by hd to get the volume times gravitational acceleration times distance.
- Subtract beta1 from beta to get the difference in densities.
- Multiply the result by -1 to account for the negative sign in the equation.
- Multiply the above value by V, g, hd, and (beta - beta1).
- Divide the result by the product of k and T.

4. Evaluate the expression to find the value of Nd/Na.

Remember to double-check your calculations and ensure that all the units are consistent throughout.