A gas mixture is a combination of two or more gases that are physically combined but not chemically bonded. Each gas in the mixture retains its individual properties, meaning they can be separated again if needed. Common examples of gas mixtures include the air we breathe, which is primarily made up of nitrogen, oxygen, and small amounts of other gases. Gas mixtures are important in various applications, such as in the production of industrial gases and in medical settings where specific gas compositions are required for treatments. Understanding gas mixtures is essential in fields like chemistry, environmental science, and engineering.