Gases have a variable shape is not an observed property of gases.
In a gas, particles are far apart from one another. They resemble a "ideal gas" at low temperatures and normal pressure, where there is little interaction between the particles and collisions are completely elastic. Intermolecular bonds between gas particles affect the properties more strongly at higher pressures. Most gases are transparent because of the space between atoms or molecules. Some of them, like fluorine and chlorine, have a slight tint. In general, gases respond to electric and gravitational fields less strongly than other states of matter. Gases have a low density and low viscosity when compared to liquids and solids.
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