From 3170fc4b5c915669cf209a521e551115a9bd0809 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Wed, 20 Oct 2021 11:50:20 +0200
Subject: Expand knowledge base

---
 content/know/concept/coulomb-logarithm/index.pdc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'content/know/concept/coulomb-logarithm')

diff --git a/content/know/concept/coulomb-logarithm/index.pdc b/content/know/concept/coulomb-logarithm/index.pdc
index 649806b..71b13a8 100644
--- a/content/know/concept/coulomb-logarithm/index.pdc
+++ b/content/know/concept/coulomb-logarithm/index.pdc
@@ -143,8 +143,8 @@ We know that the deflection grows for smaller $b$,
 so it would be reasonable to choose $b_\mathrm{large}$ as the lower limit.
 For very large $b$, the plasma shields the particles from each other,
 thereby nullifying the deflection,
-so as upper limit
-we choose the Debye length $\lambda_D$,
+so as upper limit we choose
+the [Debye length](/know/concept/debye-length/) $\lambda_D$,
 i.e. the plasma's self-shielding length.
 We thus find:
 
@@ -157,12 +157,15 @@ $$\begin{aligned}
 \end{aligned}$$
 
 Here, $\ln\!(\Lambda)$ is known as the **Coulomb logarithm**,
-with $\Lambda$ defined as follows:
+with the **plasma parameter** $\Lambda$ defined below,
+equal to $9/2$ times the number of particles
+in a sphere with radius $\lambda_D$:
 
 $$\begin{aligned}
     \boxed{
         \Lambda
         \equiv \frac{\lambda_D}{b_\mathrm{large}}
+        = 6 \pi n \lambda_D^3
     }
 \end{aligned}$$
 
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