try this

docs/source/FluidEquations.rst

@@ -3,21 +3,21 @@ Fluid Equations
 
 We define the following fluid variables:
 
-.. :math:`\rho_g = ` fluid density (assumed to be constant in the absence of reactions)
+where :math:`\rho_g = ` fluid density (assumed to be constant in the absence of reactions)
 
-.. :math:`\varepsilon_g = ` volume fraction of fluid (accounts only for displacement of fluid by particle, does not account for the EB walls)
+where :math:`\varepsilon_g = ` volume fraction of fluid (accounts only for displacement of fluid by particle, does not account for the EB walls)
 
-.. :math:`U_g = ` fluid velocity
+where :math:`U_g = ` fluid velocity
 
-.. :math:`p_g = ` fluid pressure
+where :math:`p_g = ` fluid pressure
 
-.. :math:`tau = ` viscous stress tensor
+where :math:`tau = ` viscous stress tensor
 
-.. :math:`g = ` gravitational acceleration 
+where :math:`g = ` gravitational acceleration 
 
-.. :math:`\beta_p = ` drag coefficient associated with a particle
+where :math:`\beta_p = ` drag coefficient associated with a particle
 
-.. :math:`V_p = ` velocity associated with a particle
+where :math:`V_p = ` velocity associated with a particle
 
 Below are the governing equations for the fluid: