How Many Atoms Are In The Human Body?

Inside Human Body

Looking Into a Mirror

Standing in front of a full-length mirror, you can look at your whole body, viewing it as a single remarkable object – a living creature. But you can also dig into details, exploring the ways your body interacts with the world around it, or how it makes use of the energy in the food you eat to get you moving.

Number of Cells in a Body

Zoom in further and you will find somewhere between 10-100 trillion cells. Each cell is a sophisticated package of life, yet taken alone, a cell certainly isn’t you. Go further still and you will find complex chemistry abounding – you have a copy of the largest known molecule in most of your body’s cells: the DNA  in chromosome 1.

Number of Atoms in a Body

Continue to look in even greater detail and eventually you will reach the atoms that make up all matter. Here traditional numbers become clumsy – a typical adult is made up of around 7, 000, 000, 000, 000, 000, 000, 000, 000, 000 atoms. It’s much easier to use scientific notation to denote the number of atoms in a human body: 7 x 10 27 atoms, meaning 7 with 27 zeroes after it.

The Universe Inside You
The Universe Inside You: The Extreme Science of the Human Body

Brian Clegg



Brian Clegg
Brian Clegg
born 1955

. Brian Clegg website
. Wikipedia

Brian Clegg is an English science writer. Clegg is the author of popular science books on topics including light, infinity, quantum entanglement, and surviving the impact of climate change.

Books Brian Clegg has written include:

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