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-rw-r--r--apps/systemlib/conversions.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/apps/systemlib/conversions.c b/apps/systemlib/conversions.c
index 2b8003e45..ac94252c5 100644
--- a/apps/systemlib/conversions.c
+++ b/apps/systemlib/conversions.c
@@ -150,5 +150,5 @@ void quat2rot(const float Q[4], float R[9])
float get_air_density(float static_pressure, float temperature_celsius)
{
- return static_pressure / (CONSTANTS_AIR_GAS_CONST * (temperature_celsius + CONSTANTS_ABSOLUTE_NULL_KELVIN));
+ return static_pressure / (CONSTANTS_AIR_GAS_CONST * (temperature_celsius - CONSTANTS_ABSOLUTE_NULL_CELSIUS));
}