1. Fluidity: Both gases and liquids can flow and take the shape of their container. This is because the particles in both states of matter have the ability to move past each other freely.

2. Compressibility: Both gases and liquids can be compressed, meaning their volume can be reduced by applying pressure. This is because the particles in both states are not fixed in a rigid structure.

3. Thermal Expansion: Both gases and liquids expand when heated. This is because the increased thermal energy causes the particles to move faster and spread out.

4. Diffusion: Both gases and liquids exhibit diffusion, which is the movement of particles from an area of high concentration to an area of low concentration. This occurs due to the random motion of particles.

5. Absence of fixed shape: Both gases and liquids do not have a fixed shape. They take the shape of their container.

6. Relative Density: While gases are generally less dense than liquids, they can still share similar densities depending on the specific substances involved.

7. Ability to dissolve substances: Both gases and liquids can dissolve other substances, although gases typically have a lower solubility than liquids.

8. Ability to transmit pressure: Both gases and liquids can transmit pressure equally in all directions. This is due to the ability of particles to move and interact with each other.

However, it's important to note that there are also key differences between gases and liquids. These differences arise from the greater freedom of movement and the weaker intermolecular forces between gas molecules compared to liquids.