The Chemics package is a collection of Python functions for performing calculations in the field of chemical and fluidization engineering. Source code for the package is available on GitHub and contributions from the community are encouraged.


If you don’t have Python installed on your computer, the Anaconda or Miniconda distribution of Python is recommended for scientific computing. After setting up Python, the Chemics package can be downloaded and installed using the pip or conda package managers.

Install Chemics using the pip package manager:

$ pip install chemics

Install Chemics using the conda package manager:

$ conda config --add channels conda-forge
$ conda install chemics


The example below imports the Chemics package then uses the rhog() function to calculate the density of a gas based on its molecular weight, pressure, and temperature.

import chemics as cm

cm.rhog(28, 170100, 773)

The ut() function calculates the terminal velocity of a particle according to the Haider and Levenspiel 1989 paper as shown below.

import chemics as cm

# Parameters
dp = 0.00016    # particle diameter [m]
mu = 1.8e-5     # gas viscosity [kg/(m s)]
phi = 0.67      # particle sphericity [-]
rhog = 1.2      # gas density [kg/m^3]
rhos = 2600     # particle density [kg/m^3]

# Haider and Levenspiel terminal velocity [m/s]
ut_haider = cm.ut_haider(dp, mu, phi, rhog, rhos)

Use the ChemicalEquation class to get properties of the reactants and products from a given chemical equation.

import chemics as cm

ce = cm.ChemicalEquation('2 HCl + 2 Na -> 2 NaCl + H2')

# returns True for balanced equation

# returns a dataframe of the reactant properties
#                HCl        Na
# moles            2         2
# species        HCl        Na
# molwt       36.458     22.99
# mass        72.916     45.98
# molfrac        0.5       0.5
# massfrac  0.613275  0.386725

More examples are available in the chemics-examples repository.


See the CONTRIBUTING document on GitHub for guidelines on contributing to the Chemics package.

Package index and modules