| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Gas mixture | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Breath | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Hydrocarbon gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Radioactive gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Air | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| War gas | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Natural gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Steam | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Manufactured gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Smoke | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Intestinal gas | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Chemical fumes | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Nitrogen gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Methyl acetylene | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Gas, fume or vapor | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Gas, fume and vapor | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Injection of gas/air into vitreous | Direct substance | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Gas endarterectomy of thoracic artery | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Gas endarterectomy with patch graft | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 4 | 
| Gas endarterectomy of head and neck artery | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Gas endarterectomy of coronary artery | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Gas endarterectomy | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Gas endarterectomy of lower limb artery | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 3 | 
| Asphyxiation by environmental toxic gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Intracranial gas endarterectomy | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 3 | 
| Pulmonary ventilation study, gaseous | Direct substance | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Judicial execution by gas chamber | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Gas endarterectomy of aorta | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 3 | 
| Gas endarterectomy of upper limb artery | Direct substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 3 | 
| Asphyxiation by environmental gas exposure | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Pneumoperitoneum - abdomen | Direct substance | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Insufflation of fallopian tube using gas | Direct substance | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of bromobenzyl cyanide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of lacrimogenic gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of ethyliodoacetate | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Lacrimogenic gas causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Gaseous material specimen | Specimen substance | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Intestinal gas | Is a | True | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Gas poisoning -accident | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| War injury caused by gas | Causative agent | True | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Medical gas | Is a | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of chloroacetophenone | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by carbon monoxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Carboxyhemoglobinemia | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Chronic carbon monoxide intoxication | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Toxic effect of carbon monoxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Toxic effect of sulfur dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of phosgene | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of bromobenzyl cyanide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Oxygen toxicity | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of hydrocyanic acid gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of nitrogen oxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of gas, fumes AND/OR vapors | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Toxic effect of nitrogen dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of brass fumes | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of freon | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Arsine poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of lacrimogenic gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of ethyliodoacetate | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of chlorine gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Carbon monoxide poisoning from motor vehicle exhaust | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Carbon monoxide poisoning from faulty furnace AND/OR heater | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Carbon monoxide poisoning from fire | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Toxic effect of fluorine gas and hydrogen fluoride | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of hydrogen sulfide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Toxic effect of carbon dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 2 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of spacecraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of military aircraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, member of crew of commercial aircraft in surface to surface transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of commercial aircraft in surface to air transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of unpowered aircraft, except parachutist, injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, parachutist injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, member of ground crew or airline employee injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by brass fumes | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by carbon monoxide from incomplete combustion of coal in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from incomplete combustion of coke in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from incomplete combustion of wood in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from incomplete combustion of kerosene or paraffin in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from blast furnace gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from kiln vapor | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by carbon monoxide from incomplete combustion of fuels in industrial use | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Accidental poisoning caused by nitrogen oxides | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by sulfur dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by freon | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by tear gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by bromobenzyl cyanide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by chloroacetophenone | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by ethyliodoacetate | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Accidental poisoning caused by hydrocyanic acid gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Self poisoning caused by motor vehicle exhaust gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Self poisoning caused by carbon monoxide | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Self poisoning caused by coal gas | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier | 1 | 
| Nitrogen oxides causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Lacrimogenic gas causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Other gas, fume or vapour causing toxic effect | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Other gas, fume and vapour causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| [X]Toxic effects of other specified gases, fumes and vapours | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Poisoning by carbon monoxide from aircraft while in transit, without accident to aircraft, other occupant of commercial aircraft in surface to surface transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Poisoning by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of other powered aircraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  | 
| Poisoning by carbon monoxide from aircraft while in transit, without accident to aircraft, other person injured | Causative agent | False | Gaseous substance | Inferred relationship | Existential restriction modifier |  |