Physical Properties: Gases have very low density, are invisible, and expand indefinitely. Unlike liquids and solids, gas particles are widely (LPG & Natural Gas): Liquefied Petroleum Gas (LPG) is widely used for cooking and heating, often available in 6kg to 35kg cylinders. It is a cleaner-burning fossil fuel than coal.Natural Gas: Primarily methane (\(\text{CH}_{4}\)), it is found underground and used for electricity generation, heating, and as a raw material for plastics and fertilizers.Bodily Function: Gas in the digestive system results from swallowed air or bacterial fermentation, causing bloating or : In some contexts, particularly in American English, "gas" is short for gasoline used in vehicles.