Sounding balloon is a term used to describe a type of balloon that is designed to be used for atmospheric research. This can include tracking meteorological data, measuring atmospheric pressure, and even monitoring the chemical composition of the atmosphere. Synonyms for sounding balloon include research balloon, scientific balloon, high-altitude balloon, and stratospheric balloon. These terms all refer to balloons that are designed to go to great heights, allowing scientists to collect data that would be impossible to gather from the ground. Sounding balloons are an important tool for atmospheric research, and their use has contributed greatly to our understanding of the Earth's atmosphere and climate.