A gas is a type of chemical element that exists in the gaseous state at standard temperature and pressure. These elements are found in Group 18 of the periodic table, known as noble gases, and include helium, neon, argon, krypton, xenon, and radon.
Gases have low boiling points and expand to fill their container, lacking a fixed shape.
- They have no definite shape or volume.
- Completely fill their container.
- Particles are very spread out and always in motion.
- Low density compared to liquids and solids.
- Highly compressible due to the space between particles.
- No strong attractive forces between particles.
- Change shape and volume with temperature changes.
- Expand when heated and contract when cooled.
- Easily mix with other gases.
- Their properties are described by the laws of gases.
