#rArr# Gases and Solids can be compressed where as Liquid cannot be compressed..
#rArr# They have different molecular structure..
#rArr# Gases have spaces between their inter-molecular bond where as Solid has tight inter-molecular bond..
#rArr# Solids and Liquids have definite volume where as Gasses don't have definite volume..
#rArr# Solids have definite shape where as Gasses and Liquids have indefinite shape..
#rArr# Gas particles have enough kinetic energy to overcome inter-molecular forces that hold solids and liquids together..