Liquefied gas refers to gases that have been converted into a liquid state through the application of pressure and/or low temperatures. Common examples include propane, butane, and natural gas. These gases are often stored in pressurized containers, making them easier to transport and use in various applications, such as heating and cooking. When liquefied, these gases occupy much less space than in their gaseous form, allowing for efficient storage and transportation. Upon release from their containers, they return to their gaseous state, making them versatile for use in industries, vehicles, and household appliances.