you are likely to find Gas in/at/on Space. Space is a type of Attribute. Thing is a type of Attribute. Variation is a type of Thing. 
Infrastructure is related to Bridge. you are likely to find Bat in/at/on Bridge. Bat is related to Creature. 
Gas --AtLocation--> Space --IsA--> Attribute <--IsA-- Thing <--IsA-- Variation 
Infrastructure <--RelatedTo--> Bridge <--AtLocation-- Bat <--RelatedTo--> Creature 