Amazing Quote by Francis William Aston
““Perhaps the most impressive illustration of all is to suppose that you could label the molecules in a tumbler of water. ... threw it anywhere you please on the earth, and went away from the earth for a few million years while all the water on the earth, the oceans, rivers, lakes and clouds had had time to mix up perfectly. Now supposing that perfect mixing had taken place, you come back to earth and draw a similar tumbler of water from the nearest tap, how many of those marked molecules would you expect to find in it? Well, the answer is 2000. There are 2000 times more molecules in a tumbler of water than there are tumblers of water in the whole earth.””
About This Quote
Source Lecture: Chemistry of Isotopes, Francis William Aston, 1922
Even with perfect molecular mixing on Earth, only a tiny fraction of marked molecules would be found in a small sample, illustrating vast scale differences.
In simple terms: Only a few marked molecules appear in a cup of water.
Key Takeaway
Recognize scale limits when analyzing mixtures.
Themes
science
scale
probability
mixing
analysis
Mood
analytical
inquisitive
Type
educational
technical
When to use this quote
- laboratory work
- environmental sampling
- quality control
Key Concepts
physics
chemistry
statistics
Questions to Reflect On
- How does scale affect detection in environmental studies?
- What methods improve sampling accuracy?
A Different Perspective
Assumes ideal mixing; real-world conditions may differ.
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