diff --git a/.idea/dataSources.xml b/.idea/dataSources.xml
new file mode 100644
index 0000000..91b8d44
--- /dev/null
+++ b/.idea/dataSources.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="gasflux" uuid="bc1d152a-2bb7-4a37-b6db-376527f2decb">
+      <driver-ref>sqlite.xerial</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.sqlite.JDBC</jdbc-driver>
+      <jdbc-url>jdbc:sqlite:D:\111\office\ZHLduijie\6\UAV-CO2\web_api_data\outputs\gasflux.db</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+      <libraries>
+        <library>
+          <url>file://$APPLICATION_CONFIG_DIR$/jdbc-drivers/Xerial SQLiteJDBC/3.51.1/org/xerial/sqlite-jdbc/3.51.1.0/sqlite-jdbc-3.51.1.0.jar</url>
+        </library>
+      </libraries>
+    </data-source>
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/gasflux/gas.py b/src/gasflux/gas.py
index 4e5620f..280e3ca 100644
--- a/src/gasflux/gas.py
+++ b/src/gasflux/gas.py
@@ -33,7 +33,7 @@ def gas_density(local_pressure: float, local_temperature_celsius: float, gas: st
     local_volume = (
         gas_variables["standard_molar_volume"]
         * (gas_variables["standard_pressure"] / local_pressure)
-        * ((local_temperature_kelvin + gas_variables["standard_temperature"]) / gas_variables["standard_temperature"])
+        * (local_temperature_kelvin / gas_variables["standard_temperature"])
     )  # m3⋅mol-1
     return mass(gas) / 1000 / local_volume