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-rw-r--r--fg21sim/utils/units.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/fg21sim/utils/units.py b/fg21sim/utils/units.py
index dfe5013..e7deb17 100644
--- a/fg21sim/utils/units.py
+++ b/fg21sim/utils/units.py
@@ -100,3 +100,6 @@ class Constants:
# Mean molecular weight
# Ref.: Ettori et al, 2013, Space Science Review, 177, 119-154, Eq.(6)
mu = 0.6
+
+ # Adiabatic index of ideal monatomic gas
+ gamma = 5.0/3.0