Interesting fact: Air is much lighter than water, but its weight can vary with temperature, pressure, and humidity.
The answer: At sea level and at 20°C (68°F), one liter of dry air weighs approximately 1.2 grams (0.0026 pounds).
Air is a mixture of gases, primarily nitrogen and oxygen. Its density changes with environmental conditions such as temperature, pressure, and moisture content. At standard atmospheric pressure and room temperature, a liter of dry air weighs about 1.2 grams. Humid air is lighter because water vapor weighs less than the nitrogen and oxygen it displaces. This property is important in meteorology, aviation, and various scientific fields.
