对齐Amesim氦气PR物性与PNVO流量

tests/test_amesim_pnl0001_pipe.py

@@ -23,7 +23,11 @@ class AmesimPnl0001PipeTests(unittest.TestCase):
         self.assertEqual(len(self.pipe.get_state_vector()), 2)
         self.assertAlmostEqual(properties.p, 15.3e6, delta=1.0e-5)
         self.assertAlmostEqual(properties.T, 293.15)
-        self.assertAlmostEqual(self.pipe.gas_mass_g(), 3.716965219188, places=10)
+        self.assertAlmostEqual(
+            self.pipe.gas_mass_g(),
+            self.pipe.gas.density(15.3e6, 293.15) * self.pipe.volume * 1000.0,
+            places=10,
+        )
 
     def test_resistance_flow_follows_pressure_gradient(self) -> None:
         forward = self.pipe.resistance_mass_flow(