diff --git a/models/medicament_models.py b/models/medicament_models.py
index fea5171..302606c 100644
--- a/models/medicament_models.py
+++ b/models/medicament_models.py
@@ -164,6 +164,7 @@ class EntityMedicamentRecord(Base):
     is_empty = Column(Integer, comment="是否空瓶")
     record_remain = Column(Float, default="0.00", comment="药剂使用余量")
     use_quantity = Column(Float, default="0.00", comment="药剂单次使用量")
+    use_volume = Column(Float, default="0.00", comment="液体药剂单次使用量 = 药剂单次使用量 / 密度")
     create_date = Column(String(50), comment="创建日期")
     create_user_id = Column(String(50), comment="创建人ID")
     create_user_name = Column(String(50), comment="创建人名称")
@@ -184,6 +185,7 @@ class EntityMedicamentVariety(Base):
     name = Column(String(50), comment="药剂名称")
     english_name = Column(String(50), comment="英文名称")
     purity = Column(String(50), comment="纯度")
+    density = Column(Float, comment="密度(单位g/cm^3)")
     # Speci = Column(Float)  # 规格
     # SpeciUnit = Column(String(50))  # 规格单位
     # Unit = Column(String(50))  # 单位