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Answer for the clue "Theoretical perfect fluid ", 9 letters:
ideal gas

Word definitions for ideal gas in dictionaries

WordNet Word definitions in WordNet
n. a hypothetical gas with molecules of negligible size that exert no intermolecular forces [syn: perfect gas ]

Wiktionary Word definitions in Wiktionary
n. (context physics English) a hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container

Wikipedia Word definitions in Wikipedia
An ideal gas is a theoretical gas composed of many randomly moving point particles that do not interact except when they collide elastically. The ideal gas concept is useful because it obeys the ideal gas law , a simplified equation of state , and is amenable ...

Usage examples of ideal gas.

Where Curious Yellow got started we do not know, but once it was in the wild, it spread like an ideal gas, percolating through the network until it was everywhere.