To appear in the Sept 2000 Encyclopaedia of Astronomy & Astrophysics, MacMillan and Institute of Physics Publishing

GAS IN GALAXIES

Joss Bland-Hawthorn and Ron Reynolds

Table of Contents

GAS IN GALAXIES

ATOMIC AND MOLECULAR CLOUDS

THE INTERCLOUD MEDIUM

THE SOLAR NEIGHBORHOOD

THEORIES OF THE ISM
The Two-Phase Model
The Three-Phase Model

THE INFLUENCE OF SUPERNOVA

THE ROLE OF PULSARS

THE INFLUENCE OF MAGNETIC FIELDS

DEPENDENCE ON GALAXY TYPE

UNANSWERED QUESTIONS

BIBLIOGRAPHY

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