Luft is a German word that translates to "air" in English. It refers to the invisible mixture of gases that surrounds the Earth, primarily composed of nitrogen, oxygen, and small amounts of other gases. Luft is essential for life, as it provides the oxygen that living organisms need to breathe and survive. In addition to its literal meaning, Luft is often used in various expressions and idioms in the German language. For example, "Luft holen" means to take a breath or pause, while "Luftschloss" refers to a fanciful idea or unrealistic dream. These expressions highlight the cultural significance of Luft beyond its physical properties.