The size of an atom is significantly smaller than the size of a human being. Atoms are the basic building blocks of matter and are incredibly small. On average, an atom has a diameter of about 0.1 to 0.5 nanometers (1 nanometer = 1 billionth of a meter). To put this into perspective, if we consider the diameter of a typical human cell to be about 10 micrometers (1 micrometer = 1 millionth of a meter), an atom would be about 100,000 times smaller than the cell.
In comparison to the size of a human being, the scale of the universe is vast. The observable universe is estimated to be about 93 billion light-years in diameter. It contains billions of galaxies, each consisting of billions to trillions of stars, as well as various other celestial objects. In contrast, the size of a human being is relatively small in cosmic terms. The average height of a human being is around 1.7 meters, which is insignificant compared to the vastness of the universe.
It's important to note that the comparison between an atom and a human being, as well as a human being and the universe, involves vastly different scales. Atoms are on the nanoscale, humans are on the human-scale, and the universe is on the cosmic-scale. Each scale represents a different order of magnitude in size, and it's fascinating to consider the immense range of scales in the universe.