From 93c8b6e86aeafb2f1b7f6b4d39049276ebbcc91c Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Wed, 5 May 2021 20:18:57 +0200
Subject: Expand knowledge base

---
 content/know/concept/euler-equations/index.pdc | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'content/know/concept/euler-equations/index.pdc')

diff --git a/content/know/concept/euler-equations/index.pdc b/content/know/concept/euler-equations/index.pdc
index cedfd93..0088d4f 100644
--- a/content/know/concept/euler-equations/index.pdc
+++ b/content/know/concept/euler-equations/index.pdc
@@ -21,7 +21,7 @@ There exist several forms, depending on
 the surrounding assumptions about the fluid.
 
 
-## Incompressible fluid, uniform density
+## Incompressible fluid
 
 In a fluid moving according to the velocity vield $\va{v}(\va{r}, t)$,
 the acceleration felt by a particle is given by
@@ -123,9 +123,6 @@ $$\begin{aligned}
     }
 \end{aligned}$$
 
-
-## Incompressible fluid, variable density
-
 The above form is straightforward to generalize to incompressible fluids
 with non-uniform spatial densities $\rho(\va{r}, t)$.
 In other words, these fluids are "lumpy" (variable density),
@@ -179,6 +176,10 @@ $$\begin{aligned}
     }
 \end{aligned}$$
 
+Usually, however, when discussing incompressible fluids,
+$\rho$ is assumed to be spatially uniform,
+in which case the latter equation is trivially satisfied.
+
 
 
 ## References
-- 
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