A condenser is a device that changes a gas into a liquid by removing heat. It is commonly used in air conditioning systems and refrigerators. When warm gas passes through the condenser, it cools down and transforms into a liquid, releasing heat in the process. This helps to keep the air inside your home or fridge cool and comfortable. In addition to cooling systems, condensers are also found in power plants, where they help convert steam back into water after it has turned turbines to generate electricity. This process is essential for maintaining efficiency in systems like steam engines and nuclear reactors.