Final answer:
A space with no air is known as a vacuum, an area without matter. Intergalactic space displays this type of emptiness to a profound extent, as the density of atoms is incredibly sparse compared to what we experience on Earth.
Step-by-step explanation:
Any space that contains no air is referred to as a vacuum. A vacuum is defined in science as a space devoid of any matter, including molecules and atoms.
This concept is crucial in understanding the vastness and emptiness of the universe. For instance, the air we breathe has about 1019 atoms in each cubic centimeter, which seems dense compared to the interstellar gas of the Galaxy, which contains about one atom per cubic centimeter.
However, if we venture further into intergalactic space, we would need to search through a cubic meter to find just one atom on average. This demonstrates the sheer scale of emptiness when we consider the universe beyond our Earth's atmosphere.
In various scientific contexts, such as physics and astronomy, we recognize that while the Galaxy and the observable universe are mostly empty space, anomalies such as interstellar clouds may contain densities of gas and dust exceeding the average by a thousand times or more.
Nevertheless, these dense areas are still closer to a vacuum than any environment we can create on Earth. Even in these denser clusters, the amount of matter is minuscule compared to what we encounter in our day-to-day lives on Earth.