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The Impressive Scale of a Mole: Understanding Atoms through Peas Analogy

This engaging analogy uses the volume of peas to illustrate the concept of a mole in chemistry. By comparing the sizes of various quantities of peas—from 100 peas hardly filling a cup to an astonishing quintillion peas blanketing Alberta—readers can grasp the enormity of a mole, which consists of approximately 6.022 x 10^23 entities. This comparison helps visualize subatomic particles, comparing the number of atoms in the human body to an unimaginable number of peas across multiple planets.

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The Impressive Scale of a Mole: Understanding Atoms through Peas Analogy

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  1. How Big is a Mole? The Green Pea Analogy

  2. If you selected one hundred (102) average size peas, you would find they occupy a volume of about 20 cm3.

  3. One million peas (106) would occupy a household refrigerator, while one billion (109) peas would fill a 3-bedroom house from cellar to attic.

  4. A trillion peas (1012) will fill a thousand houses, the number you might find in a medium-sized town. A quadrillion (1015) peas will fill all the buildings in a large city, such as Edmonton.

  5. Obviously, you will run out of buildings soon. Suppose there was a blizzard over Alberta, but instead of snow, it snowed peas. If the whole province was blanketed in peas about one meter deep, there would be about a quintillion (1018) peas.

  6. Imagine if this pea-blizzard falls over all of the continents in a one-meter deep blizzard. This will contain one sextillion (1021) peas.

  7. Now imagine the oceans are frozen and the blanket of peas covers the whole Earth. Go out and collect 250 more similar planets.

  8. Now you have one mole of peas!

  9. Go to the farthest reaches of the Milky Way and collect 250,000 planets, each the size of Earth, each covered one meter deep in peas. Now you have one cotillion (1027) peas – the number of atoms in your body.

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