STATES OF MATTER PHYSICAL CHEMISTRY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site vapor A substance in the gaseous state, which may be liquefied by increasing the pressure without altering the temperature. A gas below its critical temperature. Related categories    • STATES OF MATTER    • PHYSICAL CHEMISTRY ENTRIES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP